Added balldrop scene and made some modifications to the Scene class
Added scene name to the generic Scene class.

Added a text string to print the name of the scene to the screen.
Also added font a static font for all scenes to use.
Added a constructor to the scene class for common initialization.
Moved windowsize initialization
Added scene changing.

Added changeScene to Game class.
Also changed BallDropScene deinit to better work with random scene changes.
Added BallThrow scene.

Added a scene to simulate throwing a ball in 2D.