Added a FloatingActionButton to the conversation_fragment
that appears and disappears using the same logic as the
existing compose divider: appear when the conversation list
is scrolled away from the bottom, disappear when the list is
scrolled to the bottom.
Fixes#5651
1. Switch from 300 to 500 colors.
2. Colorize incoming conversation bubbles.
3. Colorize recipeint preference activity toolbar.
4. Support inverted colors in avatars.
5. Make status bar icons tint according to secondary color.
// FREEBIE
See WhisperSystems/TextSecure#139
This fix involves setting transcriptMode to normal on conversation view,
which resolves the issue but comes with the side effect that if you
have scrolled away from the bottom of the list, new incoming messages
will not trigger auto-scroll as they arrive.
1) Move to Fragments for the list view.
2) Switch to CursorLoader from my jankey self-managed cursor.
3) Add session security logic to the ActionBar.
4) Fix colors to be less ugly.
