- Renames GroupModel to TSGroupModel for TextSecureKit consistency.
- Refactors the settings into categories (joint work with @dtsbourg)
- Removes settings and logic for background push.
• create
• send/receive full functionality
• basic UI for group updating.
TODOS:
-group avatars not supported
-group update occurrence initiated by Android displayed in thread UI but not yet fully
Reviewed-by: @FredericJacobs