* Upgrade substrate to alpha 5.

* Upgrade serde & codec.

* update to pre-release version

* update nightly version

* fix build issue

* 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.