Use the immersive mode on Android.
Revert "Use the immersive mode on Android."

This reverts commit cc95fa4a680918861fa2b6e4136a9cbd208f9742.
The ads are placed on the bottom right of the screen.
Hide the ads by default.
Hide the ads during the game levels.
Add missing comments.
Move the Go button such that it does not overlap the ads.
Hide the action bars and use the full screen for the game.
Remove the beta from the icon.