* Add theme system
A theme which follows system design.
See: https://www.xda-developers.com/samsung-galaxy-s9-update-night-mode-schedule/
* update
to be in line with https://github.com/tuskyapp/Tusky/pull/1060/files
* Update ThemeUtils.java
* update
* Cleanup
* Update Deps
* Cleanup
* Update PreferencesActivity.kt
* Workaround to make MODE_NIGHT_FOLLOW_SYSTEM work
* Update ThemeUtils.java
* Use ThemeUtils.THEME_SYSTEM
* Update SplashActivity.kt
* Update strings.xml
* Update Deps
* Update build.gradle
* Update build.gradle
* fix tests
* 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
* inject MastodonApi into LoginActivity
* inject AccountManager into MainActivity
* inject AccountManager into SplashActivity, convert to Kotlin
* inject AccountManager into AccountActivity
* inject AccountManager into LoginActivity
* inject AccountManager into NotificationsFragment and NotificationClearBroadcastReceiver, fix MainActivity
* ooops
* use same OkHttpClient for Retrofit & Picasso
* fix ordering of okhttp interceptors
* remove dependencies on TuskyApplication
* bugfix
