FullScreen and Add animation for screen transition

1. enable fullscreen
2. add animation for screen transition
3. add new activity ModeSelectionActivity
    - Player can either choose to play challenge mode or arcade mode
    - In challenge mode, player can play different levels and if the
current level clear then it will move to the next level
   - In arcade mode, player plays with infinite blocks. There is no
clear for this mode. When player died for 3 times, the final score will
be recorded.