* Upgrade substrate to alpha 5.

* Upgrade serde & codec.

* update to pre-release version

* update nightly version

* fix build issue

* 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 to FRAME

* fix test

* add feed_values

* fix tests

* workaround check wasm issue

* workaround build issue

* Rename paint to palette.

* Fix typo.

* Update comments.

* rename srml to paint

* fix case

* fix oracle

* fix warning

* first version of oracle module