* [primitives, lang/macro] remove ink_primitives::hash module

# Conflicts:
#	primitives/src/lib.rs

* [core] remove ink_core's Selector::{from_str, from<&[u8]>} constructors

* [examples] fix DNS contract

* [examples] fix ers20

* [examples] fix other example smart contracts

* [examples] apply rustfmt

* Fix multisig example doctest

* Fix formatting

* Remove Selector::from_str() usage

* [core] add ExecutionInput abstraction

* [core, lang] adjust env and lang abstractions for call builder changes

* [lang/macro] adjust cross-call codegen to use new call infrastructure

* [core] add #[inline] to many call infrastructure functions

* [core, lang] apply rustfmt

* [core, lang, lang/macro] avoid heap mem alloc for instantiations as well

* [core] add inline annotations to some instantation infrastructure

* [core] fix clippy warning

* [core] apply rustfmt

* [examples] fix multisig_plain example contract

* [examples] apply rustfmt

* [abi] create new layout trait and structures

* [abi] remove unused import

* [abi] add missing license header

* [abi] fix clippy warning

* [primitives] add KeyPtr to ink_primitives

* [core] use KeyPtr through ink_primitives and add ExtKeyPtr trait

* [abi] use KeyPtr of ink_primitives

* [abi] make EnumLayout use StructLayout

* [abi] implement custom serde::Serialize for LayoutKey

* [abi] implement IntoCompact for layout2 module types

* [abi] add doc comment

* [abi] apply rustfmt

* [abi] add unit test for LayoutKey serialization

* [abi] rename ArrayLayout::array -> new

* [abi] add dispatch_key field to enum layout

* [abi] derive From for all Layout variants

* [abi] add unit tests for the new layout traits and data structures

* [abi] add experimental CellLayout

* [abi] make tests work again for layout2

* [abi] use specialized serializer function for LayoutKey

* [abi] refactor UnboundedLayout

* [abi] add unit test for UnboundedLayout

* [abi] apply rustfmt

* [core/derive] slightly refactor code

* [abi] simplify enum test

* [primitives] derive Debug, Copy and Clone for KeyPtr

* [abi] simplify CellLayout::new

* [abi] fix calling incorrect constructor for LayoutKey

* [abi] move layout2 module file into directory

* [core] add StorageLayout trait to storage2 module

* [abi_derive, core_derive] remove unnecessary extern crate proc_macro

* [core] imply ink-generate-abi feature by std feature

* [core] derive Metadata for env types for std feature

* [core] add Key, Hash, AccountId and String StorageLayout impls

* [core/derive] add initial structure for StorageLayout derive

* [core] add StorageLayout impls for some more prelude types

* [core] fix Box<T> impl for StorageLayout trait

* [core] implement StorageLayout for storage2::{Memory, Pack, LazyArray}

* [core] fix StorageLayout impl for LazyArray

* [core] implement StorageLayout for LazyIndexMap

* [abi] add HashLayout

* [abi] rewrite UnboundedLayout test to HashLayout test

* [abi] remove unbounded layout

* [abi, core] apply rustfmt

* [core] add initial skeleton for StorageLayout tests

* [core] add StorageLayout impls for Lazy, LazyCell and LazyHashMap

* [core] add StorageLayout impls for Option and Result

* [core] add LayoutCryptoHasher trait

* [core] fix StorageLayout impl for LazyHashMap

* [core] apply rustfmt

* [core] add StorageLayout impl for storage2::Vec

* [core] add StorageLayout for storage2::SmallVec

* [core] implement StorageLayout for storage2::Stash

* [core] implement StorageLayout for storage BitStash, Bitvec and HashMap

* [core] improve StorageLayout impl for storage2::Vec

* [core] apply rustfmt

* [abi] fix clippy warning

* [core] add StorageLayout impl for storage2::alloc::Box

* [core] add StorageLayout impl for DynamicAllocator

* [core/derive] impl StorageLayout derive for struct items

* [core/derive] make StorageLayout derive work for enum items

* [core/derive] fix expansion for nested enums

* [core/derive] fix a bug with nested enums

* [core/derive] add unit test for MixedEnum

* [core/derive] apply rustfmt

* [lang] add revision 2 module

* [core] remove generic T: EnvTypes param from Dispatch trait

* [lang] remove unnecessary import

* [lang] remove unnecessary generic parameter

* [lang/macro] generate codegen for the new v2 traits

* [core] re-export SpreadLayout and PackedLayout macros from within ink_core

* [lang] further adjustments to make ink_lang_macro work with storage2

* [lang, core] apply rustfmt

* [lang] fix clippy warning

* [lang] fix some bugs with constructors without inputs

* [examples] adjust the Flipper example contract for the changes

* [lang] remove codegen for testing ink! contracts

No longer needed.

* [lang] remove test-env crate feature

* [lang] minor improvements to EnvAccess utility type

* [examples] remove unused import for Flipper

* [examples] remove test-env crate feature for Flipper

* [lang] remove unused IdentType::span method

* [examples] Flipper: adjust contract for ink_lang changes

* [examples] adjust Erc20 for the ink_lang changes

* [examples] fix some indentation in Cargo.toml

* [examples] adjust DNS contract for ink_lang changes

* [examples] adjust ERC721 for ink_lang changes

There is still a bug that we need to fix in ink_core.

* [example] adjust lib.rs of ERC721 to ink_lang changes

* [examples] adjust Delegator example contract for ink_lang changes

* [lang_macro] generate SpreadLayout and PackedLayout impls for cross-calling wrappers

* [core] release storage2::Stash::entries() iterator for non-testing API

* [core] add SpreadLayout and PackedLayout impls for () type

* [examples] convert multisig contract example to new ink_lang

* [examples] fix incrementer Cargo.toml indentations

* [examples] adjust runtime-storage example contract for ink_lang changes

* [core] apply rustfmt

* [lang] generate correct attributes for messages

* [examples] make use of derive(Default) for DNS example

* [lang_macro] improve some ink! error messages

* [lang_macro] update all compile tests

* [examples] multisig: ignore doc test

This needs serious fixing later! @athei

* [lang] remove old ink_lang abstractions

* [lang] remove no longer needed ink_lang modules

* [lang_macro] add compile test for derive on storage struct

* [examples] ignore failing doc test

* [examples] actually ignore the failing doc-test for multi-sig

* [lang] move v2 module back to origin

* [lang_macro] adjust codegen for new dispatch module structure of ink_lang

* [lang_macro] no longer impl ink_core::{Flush, AllocateUsing} for ink! dependencies

* [lang_macro] use root namespaces in codegen everywhere

* [lang] apply rustfmt

* [lang_macro] use only root namespaces in codegen (forgot some)

* [lang] remove nightly Rust feature usage

* [core] re-export StorageLayout from ink_core::storage2::traits

* [lang,abi] adjust ink! metadata generation codegen to new layout

* [lang] use root namespaces in codegen

* [examples] apply rustfmt

* [lang] update cross-calling codegen for new storage layout

* [examples] update Delegator example contract

* [examples] apply rustfmt

* [abi] remove StorageLayout trait from ink_abi crate

* [examples] apply rustfmt

* [examples] fix clippy warning

* [examples] fix multisig_plain contract

* [examples] apply rustfmt

* [examples] fix clippy warning

* [examples] remove commented out code from multisig_plain example

* [lang] refactor codegen for contract storage struct

* [lang] fix unused import warning

* [lang] eliminate CrossCallingConflictCfg

* [lang] do not generate normal storage struct as dependency

* [lang] re-introduce cross calling conflict cfg codegen

* [lang/macro] refactor codegen for cross-calling

* [lang] add new traits for Event connectors

* [lang/macro] use connectors API for event codegen

* [lang/macro] apply rustfmt

* [lang/macro] remove out-of-ink-module export

* [abi] fix selector encoding

* [lang/macro] fix unused warning

* [examples] adjust example smart contracts for recents ink_lang_macro changes

* [abi] fix unit test for selector

* [chores] update README ink! example

* [alloc] silence warnings of unused unsafe for core::intrinsics::abort

* [examples] apply rustfmt

* [lang/macro] fix codegen for `cargo test`

* [*] replace ink-generate-abi crate feature everywhere with std

* [examples] fix Cargo.toml for generating metadata

* [examples] move flipper/src/lib.rs one up

* [examples] move lib.rs to root folder

* [examples] fix Cargo.toml of ERC721

* [examples] apply rustfmt to ERC20

* [examples] apply rustfmt to ERC721

* [examples] apply rustfmt to all examples

* [abi] remove unused serialize_selector function

* [examples] fix bug that DNS example still used type-metadata crate

* [example] fix bug in multisig_plain example

* Move spec tests to separate file

* Add contract spec serialization test

* Camel case field names

* Encode selector as hex string

* Move specs module back to top level

* Move layout test to tests.rs

* Layout externally tagged enums & camelCase

* Format code

* Rename TypeSpec::ty -> TypeSpec::id

* TEMPORARY: Use my type-metadata branch

* Derive TypeInfo for Key

* Switch from type_metadata to scale_info

* Convert layout to using scale-info

* Fix scale-info optional dependencies

* Fmt

* Fix up straggling type-metadata dependency

* scake-info master

* Use scale-info from crates.io

* oops

* Fix compilation errors

* Fmt

* Fix examples manifests

* Remove redundant into()

* [core] fix unused warning

* [*] bump version 2.0.0 -> 2.1.0

* [*] initial swipe over codebase to tag 2.0.0 release

* [*] fix a number of issues with the previous version setup

* Added a multisig example contract

* Added crate documentation

* Update examples/multisig_plain/lib.rs

shortcut for iter over references

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

rename ensure_from_owner

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

renaming

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

renaming

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

renaming

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* renamings

* Better name for internal_confirm

* Renamed id -> trans_id

* Better name for ensure_requirement

* Renamed to confirm_by_caller

* Reformat conform_by_caller

* Remove unwraps in favor of expect

* More documentation

* Added license header

* Fix style issue in documentation

* Updated documentation

* Add warning about not using this in production

* Remove run_test for now as it's not working

* Fix metadata generation

* Use the EnvTypes type alias provided by the contract macro

* fix typo

* Emit Events

* Fix doc typos

* Do actual checking in contract_works test

* Added more tests (currently failing)

* Replace HashMap with BTreeMap

* Add docs regarding privileged wallet messages

* Added tests

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Remove superflous .cargo/config

* Add proper author information to manifest

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Apply suggestions from code review

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* gas_limit is not measured in Balance

* Update examples/multisig_plain/lib.rs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Switch owners, requirement argument position

* Remove mutate_map and use entry api instead

* Split execute into invoke and eval

This allows for evaluating the result of a call if needed.

* Remove superflous self argument of ensure_requirement_is_valid

* Switch parameterize_call arguments

* Return ConfirmationStatus after doing a confirmation

* Remove superflous insert into confirmation_count

* Rework public documentation

* Missing empty line in docs

Co-Authored-By: Hero Bird <robin.freyler@gmail.com>

* Unify exection Events

* Rework add_owner example to have an actual chance of compiling

* Remove redundant closure

Co-authored-by: Hero Bird <robin.freyler@gmail.com>