Tweak some dimens so that they line up with the 8dp grid. This doesn't
apply to all of them since some of them are fined-tuned [such as the
fast-scroller]. The latter would likely be migrated in the later UI
overhaul.
Instead of using @color/background directly, use ?attr/colorSurface
so that changes can be made to the theming easier. This also
resolves some more minor issues regarding certain widget's
backgrounds.
Refactor/Rewrite the database system to be based on SQLiteOpenHelper instead of Room, as Room will keep empty columns around even after trying to explicitly delete them.
Use BottomNavigationView as the main navigator of Auxio instead of a ViewPager + BottomNavigationView, primarily to fix some memory leaks and give Auxio a better UI design overall.
Remove MusicRepository/All Library models and replace it with a single shared ViewModel, Move MainFragment into MainActivity, and remove the LoadingFragment -> MainFragment navigation path.
Fix a bug with the permission checking where the MusicRepository would return NO_PERMS to the LoadingFragment faster than the creation of the view, causing the error message to never display. Permission checks are now handled by LoadingFragment instead.
