* Prep helper fn to reuse code
* Adjust error to match current _initialize_account handling
* Add new helper to initialize extension from ExtensionType
* Include required extensions in InitializeAccount processing
* Initialize native mint
* Add missing native-mint test case for get_account_data_size
* Remove superfluous mint unpack
* Limit scope of StateWithExtensionsMut method
* Update comments to be correct
* Check account length vis-a-vis required extensions in Initialize
* Noop confidential-transfer case, add comments, and make fn name more explicit
* gt -> ne
* token: Extension state packing
* Move to bytemuck
* Cleanup a bit
* Remove all unsafe, address feedback
* Address feedback
* Add test for multisig-length account
* Add tests for Account and multi-extension
* Remove last todo
* Add more tests
* token-2022: Add transfer fee accounts and instructions
* Address feedback
* More feedback
* Move to mixins
* Separate instructions for mixin initialization
* Feedback again again again!
* Getting there...
* More more feedback again again
* Add `WithdrawWithheldTokensFromAccounts` instruction
* Add instruction serde, fix all errors