* convert MainActivity to Kotlin
* migrate to MaterialDrawer 8
* fix drawer styles
* revert removing BezelImageView and material_drawer_header override
* fix tests
* add lost comment back to material_drawer_header.xml
* add tools:parentTag to material_drawer_header.xml
* use when instead of if in MainActivity
* fix statusbar color over the drawer
* cleanup drawer item creation
* tint secondary drawer items as well
* remove unnecessary ids
* fix header text color in the light theme
* improve header text contrast
* Add new Elephant Friend images. Use them in ListsActivity.
* Add error images to AccountListFragment
* Add error images to Timeline & Notifications fragment. Needs rework.
* Introduce BackgroundMessageView. Use it in AccountList.
* Use correct button style for BackgroundMessageView
Co-Authored-By: charlag <charlag@tutanota.com>
* Use BackgroundMessageView
* Add BackgroundMessageView docs
* Re-color and document elephants
* Apply feedback, disable refresh when error is shown
* Fix string typo
* upgrade to AndroidX, upgrade libraries
* move to MaterialComponents theme
* make sure the compose button looks good everywhere
* fix tollbar title/button alignment on tablet
* move to new material color theming, consolidate colors and themes
* fix build, fix imports
* set error on TextInputLayout instead of EditText
* fix imports, TootButton when
* improve snackbar style
* fix task description color