* Add `engine` crate

* Add `env_types` crate

* Adapt `env`, `lang` and `storage`

* Adapt examples

* Adapt CI

* Symlink license and readme

* Throw `TypedEncoded` out of `engine`

* Improve Erc20

* Bump versions to rc3

* Fix clippy error: Manual implementation of `Option::map` (#717)

* Implement comments

* Fix yml

* Improve structure

* Add tests

* Fix function signature

* Get rid of `engine`s singleton

* Revert instantiate stuff

* Implement review comments

* Make `Storage` non-generic

* Improve API for emmitted events

* Migrate to `panic_any`

* Clean up import

* Import `panic_any`

* Implement comments

* Fix param

* Use type

* Store balances in chain storage

* Fix tests

* Use individual storage per contract

* Implement comments

* Add `.config`

* Fix hunspell complaints

* Run spellcheck in CI

* Improve hunspell config

* Fix 'pre' prefix

* Remove `|` from dictionary

* Add missing words to dictionary

* Add missing words to dictionary

* Add missing words to dictionary

* Fix `n`-th → nth

* Fix indentation

* Remove comment

* Fix number

* Fix spacing

* Remove regex

* Apply suggestions from code review

Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>

* Fix dictionary

* Fix dictionary

* Implement review comments

* Replace SRML with FRAME

* Replace occurrences of 'spreaded'

* Tuning text regarding 'spreaded'

* Update crates/storage/src/lazy/entry.rs

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

Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>
Co-authored-by: Hero Bird <robin.freyler@gmail.com>

* Add generalized collection fuzz testing

* Use `StorageHashMap::FromIter`

* Use `saturating_mul`

* Update to new `quickcheck` API

* Adopt year to 2021 in license

* Implement suggestions from review

* Fix broken intra-doc links

* Fix doc link

* Add CI stage to test example docs

* Revert me: Provoke doc failures in example

* Remove intra-crate link to non-dependency

* Remove `--all-features`

* Revert "Revert me: Provoke doc failures in example"

This reverts commit 563bfeb3.

* Prettify paragraph

* Remove unnecessary imports

* Revert "Remove unnecessary imports"

This reverts commit 05207133

.

* Remove unnecessary imports

* Remove `cfg(doc)` path resolution for doc comments

* Improve language and formatting

* Upgrade `scale` and `scale-info` for `rand-extension`

* Make http link work

* Remove `crate::` prefix from doc links

* Apply suggestions from code review

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

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

* Make `Lazy::Drop` always clear up all its storage

* Fix typo: yet ➜ get

* Fix macro import

* Make tests off-chain since they interact with storage now due to Drop

* Make use of `REQUIRES_DEEP_CLEAN_UP`

* Clear up all footprint cells

* Fix typo: yet ➜ get

* Fix case

* Macro ➜ fn

* Fix typo: invariances ➜ invariants

* Fix comment

* Reduce code duplication in HashMap tests

* Add test api getters for used storage

* Add regression tests for complete storage clearance of nested Lazy's

* Always clear inner cell

* Bring costs of bug fix down

* Apply suggestions from code review

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

* Rename function

* Throw out convenience method, clarify variable names

* Clarify comment

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

* [env] rename Env -> EnvBackend, TypedEnv -> TypedEnvBackend

* [env] rename EnvError -> Error

* [*] rename ink_env::EnvTypes -> Environment

Namely rename:
ink_env::EnvTypes -> Environment
ink_env::DefaultEnvTypes -> DefaultEnvironment

* [*] update cfg-if dependency 0.1 -> 1.0

* [alloc] rename ink_alloc -> ink_allocator

* [env] forgot to rename in lib.rs

* [env, lang] fix some bugs with ink_env::EnvError -> Error renaming

* [ci] adjust renaming of ink_alloc -> ink_allocator

* [env] apply rustfmt

* [lang/macro] re-enable disabled UI test

* [examples] DNS: apply rustfmt

* [examples] ERC-20, ERC-721: apply rustfmt

* [*] split ink_core into ink_env and ink_storage

The workspace does not yet compile!

* [env] make compile again

* [env] fix doc tests

* [storage] make crate compile again

* [env] fix some doc comment links

* [README] flipper example: remove unused import

* [storage/derive] fix compilation of generated code

* [README] add ink_storage and ink_env doc links

* [env, primitives, storage] fix docs

* [lang] make compile again

* [lang/codegen] use absolute paths in #[ink::test] proc. macro

* [examples] make compile again

* [*] apply rustfmt

* [env] remove unneeded dependencies

* [storage] remove all unneeded dependencies and crate features

* [*] update outdated dependencies

* [env, lang] remove unused dependencies

* [*] fix comments

* [*] fix some intra doc links

* [ci] adjust to split ink_env and ink_storage crates

* [ci] forgot to handle split ink_env and ink_storage in docs

* [storage] fix fuzz tests

* [examples] apply rustfmt

* [examples] apply rustfmt (ERC-721)