join/leave functionality
URBNG-54 [Android] Join/leave the game URBNG-268
[Android] Add join/leave functionality to buttons

Ready Join Leave Functionality. [It requires Kamil's login/register
related classes
small testing line removal
Merged with [Android] Completed URBNG-357, URBNG-358, URBNG-359 from URBNG-55
Merged with URBNG-268 [Android] Add join/leave functionality to buttons