* Use 'Pallet' struct in construct_runtime.
* Fix genesis and metadata macro.
* Fix 'Pallet' type alias.
* Replace 'Module' with 'Pallet' for all construct_runtime use cases.
* Replace more deprecated 'Module' struct.
* Bring back AllModules and AllPalletsWithSystem type, but deprecate them.
* Replace deprecated 'Module' struct from merge master.
* Minor fix.
* Fix UI tests.
* Revert UI override in derive_no_bound.
* Fix more deprecated 'Module' use from master branch.
* Fix more deprecated 'Module' use from master branch.
* Add MMR custom RPC.
* Change RuntimeApi to avoid hardcoding leaf type.
* Properly implement the new RuntimeAPI and wire up RPC.
* Extract Offchain DB as separate execution extension.
* Enable offchain DB access for offchain calls.
* Fix offchain_election tests.
* Skip block initialisation for proof generation.
* Fix integration test setup.
* Fix offchain tests. Not sure how I missed them earlier 🤷.
* Fix long line.
* One more test missing.
* Update mock for multi-phase.
* Address review grumbbles.
* Address review grumbles.
* Fix line width of a comment
* Decouple the session validators from im-online
* .
* Add SessionInterface trait in im-online
Add ValidatorId in im-online Trait
Make im-online compile
Make substrate binary compile
* Fix merging issue
* Make all compile
* Fix tests
* Avoid using frame dep in primitives via pallet-session-common
* Merge ValidatorSet into SessionInterface trait
Wrap a few too long lines
Add some docs
* Move pallet-sesion-common into pallet-session
* Move SessionInterface to sp-session and impl it in session pallet
Ref https://github.com/paritytech/substrate/pull/7127#discussion_r494892472
* Split put historical::FullValidatorIdentification trait
* Fix line width
* Fix staking mock
* Fix session doc test
* Simplify <T as ValidatorIdentification<AccountId>>::ValidatorId as ValidatorId<T>
* Nits
* Clean up.
* Make it compile by commenting out report_offence_im_online bench
* Tests
* Nits
* Move OneSessionHandler to sp-session
* Fix tests
* Add some docs
* .
* Fix typo
* Rename to ValidatorSet::session_index()
* Add some more docs
* .
* Remove extra empty line
* Fix line width check
.
* Apply suggestions from code review
* Cleaup Cargo.toml
* Aura has migrated to Pallet now
Co-authored-by: Tomasz Drwięga <tomasz@parity.io>