This pr implements support for returning errors of different pallets in
a pallet. These errors need to be declared with `decl_error!`.

The pr changes the following:

- Each dispatchable function now returns a `DispatchResult` which is an
alias for `Result<(), DispatchError>`.
- `DispatchError` is an enum that has 4 variants:
  - `Other`: For storing string error messages
  - `CannotLookup`: Variant that is returned when something returns a
  `sp_runtime::LookupError`
  - `BadOrigin`: Variant that is returned for any kind of bad origin
  - `Module`: The error of a specific module. Contains the `index`,
  `error` and the `message`. The index is the index of the module in
  `construct_runtime!`. `error` is the index of the error in the error
  enum declared by `decl_error!`. `message` is the message to the error
  variant (this will not be encoded).
- `construct_runtime!` now creates a new struct `ModuleToIndex`. This
struct implements the trait `ModuleToIndex`.
- `frame_system::Trait` has a new associated type: `ModuleToIndex` that
expects the `ModuleToIndex` generated by `construct_runtime!`.
- All error strings returned in any module are being converted now to `DispatchError`.
- `BadOrigin` is the default error returned by any type that implements `EnsureOrigin`.

The finality-grandpa module needs two sets of functionalities from the
network:

1. Everything gossip related, e.g. event_stream, write_notification, ...

2. The ability to set a fork sync request for a specific block hash.

Instead of embedding (2) inside of (1) this patch extracts (2) from (1)
having finality-grandpa depend on a `Network` that fulfills the
`network_gossip::Network` trait and that can set block sync requests.

On the one hand this improves the overall structure splitting things
that don't logically belong together. On the other hand it does
reintroduce a lot of trait bounds within finality-grandpa.

* RPC forwarders for adding reserved peers

* implement service side of reserved-peer RPCs

* Clean up unnecessary format! invocation

Co-Authored-By: Niklas Adolfsson <[email protected]>

* add some tests for the new RPC methods

* remove redundant `data` field

Co-Authored-By: Tomasz Drwięga <[email protected]>

pallet-evm: default implementation for FeeCalculator and ConvertAccountId and separate gas price (#4424)

* Default implementation for FeeCalculator and ConvertAccountId and separate gas price

* Styling fixes and some docs addition

* TruncateConvertAccountId -> HashTruncateConvertAccountId

* Fix compile

* Add linear back-off for aura slot workers

* logging

* Use slot from header

* Get network id for Edgeware and add to subkey

* Update assets to `decl_error`

* Update aura to `decl_error`

* Update authority discovery to `decl_error`

* Update collective to `decl_error`

* Update evm to `decl_error!`

* Fix error with replace

* Revert "Update authority discovery to `decl_error`"

This reverts commit 26e8f3c5.

* Revert "Update aura to `decl_error`"

This reverts commit 8f17c44c.

* Update democracy to `decl_error`

* Update finality-tracker to `decl_error`

* Update grandpa to `decl_error`

* `assert` to `ensure` in dispatchable function

* Fix the subkey error message

* Fix check_benchmarks

* Remove incorrect assumption that runners-up were sorted by account

* Fix

* Update lib.rs

* Dust moves from reserved <-> free if below ED

* Add dust information to `ReapedAccount` event

* Introduce `BalanceSet` event

* More cleanly written `set_balance` logic

* clean up cargo.toml syntax

* bumping versions to 2.0

* bump networking to 0.8

* move consensus down to 0.8

* bump consensus pallets to 0.8.0, too

* Upping babe and aura pallets

* add remaining, missing version definitions

* missed some

* rewrite me

* [cli]: make `BlockNumber` generic

* cleanup

* Fix contruct_runtime

* Update lib.rs

* Update event.rs

* Update event.rs

* Update event.rs

* Update event.rs

* Update event.rs

* Update event.rs

* Update event.rs

Back to where we started

* Update chain_spec.rs

* Update genesis.rs

* Fix it properly

* Fix naming of utility crate (it's a legit pallet)

* Additional bits

* Make sudo use `decl_error`

* copy pasta error

* Update to use `as_str`

* Add doc

* Add back `decl_error`

* Rename: Phase 1.

* Unify codec.

* Fixing: Phase 2

* Fixing: Phase 3.

* Fixing: Phase 4.

* Fixing: Phase 5.

* Fixing: Phase 6.

* Fixing: Phase 7.

* Fixing: Phase 8. Tests

* Fixing: Phase 9. Tests!!!

* Fixing: Phase 10. Moar tests!

* Finally done!

* More fixes.

* Rename primitives:: to sp_core::

* Apply renames in finality-grandpa.

* Fix benches.

* Fix benches 2.

* Revert node-template.

* Fix frame-system in our modules.

* Updates; not yet tested.

* Fix and add tests

* Add test

* Update a few comments

* Remove proposal when it is refused.

* Fix build, add test

* Simplify adding new Ss58AddressFormat variant and add KulupuAccountDirect

* Only enable std conversion in std

* fix srml-support compilation

* babe: exponential backoff on missed blocks.

* In progress, runtime io must switch to future proof root +
child_specific (unique id) + u32 type.

* Switch interface, sr-io seems ok, rpc could use similar interface to
sr-io, genesis json broken if there is child trie in existing encoding
genesis.

* test from previous implementation.

* fix proving test.

* Restore Keyspacedb from other branch, only apply to child trie.

* Removing unneeded child_info from child root (child info are stored
if things changed, otherwhise the root does not change).

* Switch rpc to use same format as ext: more future proof.

* use root from child info for trie backend essence.

* Breaking long lines.

* Update doc and clean pr a bit.

* fix error type

* Restore removed doc on merge and update sr-io doc.

* Switch child storage api to use directly unique id, if managed id
where to be put in place, the api will change at this time.

* Clean deprecated host interface from child.

* Removing assertion on child info (can fail depending on root
memoization).

* merging child info in the overlay when possible.

* child iteration by prefix using child_info.

* Using ChainInfo in frame support. ChainInfo gets redesign to avoid
buffers allocation on every calls.

* Add length of root to the data of child info.

* comments

* Encode compact.

* Remove child info with root.

* Fix try_update condition.

* Comment Ext child root caching.

* Replace tuples by struct with field

* remove StorageTuple alias.

* Fix doc tests, and remove StorageOverlay and ChildStorageOverlay
aliases.

* Extract gossiping system from network

* Finish porting GRANDPA tests

* Try put correct engine ID

* Fix messages encoding

* Fix communication tests

* Use a threads pool to spawn stuff

* Fix compilation everywhere

* Fix bad merge conflict

* Remove dependency on async-std

* Apply suggestions from code review

Co-Authored-By: Robert Habermeier <[email protected]>

* More suggestions

* Remove network startup GP future

* Update to futures_timer

* adjust wait_when_behind test

* Pass correct Roles after handshake

* Revert "adjust wait_when_behind test"

This reverts commit 9e310244.

* Crate root documentation

* Remove MessageRecipient

* Address concerns

* Fix more concerns

* Forgot Cargo.lock

* update comments in authority discovery

* Update lib.rs

* Allow owner of a preimage to reap it a little while before everyone else.

* Revamp DispatchQueue to make reaping safer

* Remove commented code

* Update frame/democracy/src/lib.rs

Co-Authored-By: Shawn Tabrizi <[email protected]>

* Update docs

* client/rpc/api -> client/rpc-api

* client/util/wasm-builder-runner -> utils/wasm-builder-runner

* client/grafana-data-source -> utils/grafana-data-source

* test/utils -> test-utils

* fix moved path

* Update Cargo.lock

* Update Cargo.lock

* Allow referendums to begin out of order

* Make `inject_referendum` infallible

* Merge remote-tracking branch 'origin/gav-verified-id' into gav-verified-id

# Conflicts:
#	frame/identity/src/lib.rs

* Renames.

* rename crate: sp-transaction-pool-api -> sp-transaction-pool

* move primitives/core/derive-debug -> primitives/derive-debug; primitives/core/storage -> primitives/storage

* rename crate sp-core-storage -> sp-storage

* rename and move: test/utils/transaction-factory -> client/transaction-factory

* move transaction-factory -> node/transaction-factory

* fix missing rename

* Move chain-spec-builder into bin/utils

* move subkey into bin/utils

* Update new subkey location

* Update docs to reflect new location for utils

* fixing import name

* Fix token economics url.

Co-Authored-By: Bastian Köcher <[email protected]>