Changes:
	- The InputAnonymizer now extends to Actor class. It will query the
gyro each frame if the gyro is available.
	- The InputProcessor is now being set within the InputAnonymizer class
instead of in the MainGame Class. So that the InputProcessor can only
listen to the keyboard events or touch screen events depends on
different situations.
	- In the MainGame class, there is now a stage and an actor. The actor
is the InputAnonymizer.