Removed DayNight theme. Added a 'white' theme for Light, and 'black' theme for Dark.
Users will have to set the type of Light or Dark theme they want to use.
Default is white for light, black for dark.
More themes will be added later.
* General (makeshift): Set default first-tab to be profile, adjust search button appearance logic, add fragment labels
* DM inbox items: Adjust group chat avatar sizes, reinstate unread indicators
* DM thread: Swap buttons per spirit of #122
* Profile: Fix story fetcher logic
* Story: Fix bug where first story can't scroll to next user, unify subtitle to timestamp, swap buttons per #122
* Comment: Unfocus replying comment when X is pressed
This commit sets up the base for future enhancements in direct messages. The changes are:
1. Introducing fragments and navigation using androidx.navigation.fragment.NavHostFragment.
2. Using ListAdapter and LiveData for the RecyclerViews.
3. Fixes a bug where a single direct message was lost when querying older messages.