First attempt to write AF to the screen.
Had to add multiple signals to my sensitivity list and add a default value for my pixel signals.  Draws an AF correctly.
First attempt to add the pong_control module.  Currently just used to assign values to the ball and paddle positions.  No logic yet.  Also, updated pixel_gen to display the ball and paddle.
Changed the types of my generics in pixel_gen.  Also resized my ball and paddle parameters.