* update eslint's `comma-dangle` rule to `always-multiline`
* add check and fix scripts to package.json
* Invoke `yarn fix` to adopt the updated eslint rules. No other changes are included.
* objective-C share extension
* MattermostBucket module to share data between the main app and the extension
* middleware that shares the data between the main app and the extension
* Fix setState when safe area in unmounted
* Share extension for iOS
* Fastlane changes to include iOS share extension
* Fix unit test
* Feedback review
* define proptypes for icons
* Add right sidebar
* initial implementation of the right drawer
* Do not hide status bar on drawer open
* initial options in the RHD
* Fix android layout
* feedback review
