* add constructor for CheckOperator

* refactor the traits related to Currency

* format code

* modify

* update test cases

* update test cases

* auction, oracle and prices brief documentation

* add gradually-update and schedule-update brief doc

Co-authored-by: Ermal Kaleci <ermalkaleci@gmail.com>

* Add tokens module documentations.

* Add currencies module documentations.

* Add installation documentations.

* add schedule-update

* add unit test

* fix schedule-update/Cargo.toml

* add try_for_each

* add next_block_number

* update to pre-release version

* update nightly version

* fix build issue

* Add vesting documentations.

* Add vesting module README.

* Fix type.

* Fixed128 implementation

* update

* updates

* cleanup

* fixes & cleanup

* update

* add schedule-update

* schedule-update add convert_vec_to_u8

* fix ci build

* remove sp_state_machine

* change OnReapAccount to OnKilledAccount

* emit events by transfer, deposit, withdraw

* Use Event<T> instead of RawEvent outside decl_module.

* add unit test

Co-authored-by: Shaopeng Wang <spxwang@gmail.com>

Co-authored-by: Xiliang Chen <xlchen1291@gmail.com>

* remove ensure_lockable

* remove unused

Co-authored-by: Xiliang Chen <xlchen1291@gmail.com>

* update substrate

* fix tests

* make feed_value FreeOperational

* methods free_operational

* validate call

* validate call

* update

* OnNewData accepts who: AccountId

* missing comma

* Fix SignedExtension implementation

* Update oracle/src/lib.rs

* fix tests

* fix import

* move has_dispatched check into module call

* OnRedundantCall

* update

Co-authored-by: Xiliang Chen <xlchen1291@gmail.com>

* Rename oracle rpc fn name.

* Update to new set_lock api.

* Fix due to pallet_balances breaking changes.

* Remove unused imports.

* fmt

* Oracle rpc api.

* Manual Serialize impl for FixedU128; Manual Display impl for TimestampedValue.

* Remove unused Display impls.

* Fixed some wired failing existing unit tests.

* Impl Deserialize for FixedU128.

* Rename oracle rpc method name.

* fmt

* Renaming.

* Init vesting module.

* Impl add vesting schedule.

* Renaming dependencies.

* Renaming vesting module event.

* Checked arithmatic.

* Adding new vesting schedule merges with outstanding locked balance and until.

* Make VestingSchedule fields public.

* Claim vesting.

* Update locked_amount calculation.

* Unique saturated into.

* Unit test of claim call.

* Add update_vesting_schedules.

* update_vesting_shedules unit tests.

* Ensure lockable.

* Minor fixes.

* Remove todo comment.

* Merge fixme comments.

* Add dust removal and transfer_all in orml-tokens.

* Ensure existential rule for transfer, deposit and withdraw.

* orml-tokens transfer: return error if dest balance is zero and transfer amount below existential deposit.

* set_balance helper.

* Existential deposit unit tests.

* Fix orml-currencies mock.

* Renaming.

* Update transfer_all in orml-tokens.

* Add root call 'update_balance' in orml-currencies.

* 'update_balance' unit tests.

* orml-currencies: delegate transfer and update_balance call to multi-currency impl.

* add remove_auction function

* add Eq and PartialEq traits for AuctionId