This reverts commit 77aeced1.

* Converted Vec storage to BoundedVec

* Updated tokens impl

* Added MaximumLocksExceeded error

* Renamed error MaximumLocksExceeded to MaxLocksExceeded

* Test for exceeding maximum locks

* Added MaxEncodedLen derives

* Removed explicit Result return

* Fix mocks.

* Replace deprecated.

* Migrated auction mock file to construct_runtime macro

* Migrated currencies mock file to contruct_runtime

* Migrated gradually-update mock file to construct_runtime

* Migrated nft mock file to construct_runtime macro

* Migrated oracle mock file to construct_runtime

* Migrated rewards mock file to construct_runtime macro

* Migrated mock file to construct_runtime macro

* Migrated mock file to construct_runtime macro

* Tidy up oracle module.

* Tokens and currencies module.

* Apply convention to modules.

* migrate rewards module

* migrate gradually-update module

* migrate currencies module

* migrate vesting module

* migrate auction module

* migrate authority module

* migrate tokens module

* fix clippy

* Update orml.

* Update substrate.

* fix mocks.

* Apply substrate breaking change.

* Fix readme typo.

* refactor try_mutate_account

* remove OnReceived

* fix issues per review

* update

* update for rc5

* update for rc5

* remove system

* fix format

* fix format

* Update lib.rs

fix format build failed

Co-authored-by: zjb0807 <zjb0807@qq.com>

* impl OnReceived for tokens

* update storage map keys of tokens

* remove ExistentialDeposit

* switch subsrate dependencies to crates.io

* Add descriptions to all cargo subprojects

* Add repository field to all cargo subprojects

* Modify GitHub actions to run cargo unleash

* Add license-file field to all cargo subprojects

* Remove pallet-balances/std feature from std feature of schedule-update

* Add version numbers to path dependencies

* Fix compilation errors on all cargo subprojects

* Attempt to force use one version of the compiler

* Put cargo unleash step at the very end

* Fix all test compile errors

* Use drain_prefix instead of drain

* fix tests

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

* Renaming substrate deps to their package names.

* Combine imports.

* add constructor for CheckOperator

* refactor the traits related to Currency

* format code

* modify

* update test cases

* update test cases

* 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>

* update substrate

* fix tests

* Rename oracle rpc fn name.

* Update to new set_lock api.

* Fix due to pallet_balances breaking changes.

* Remove unused imports.

* fmt

* 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.