Removed some legacy assets and hooked up new assets.
Removed more legacy assets.
Background now contains two copies of the image, the second copy is
placed to the right of the first.
second image set in background is correctly destroyed.
Background now scrolls, at the cost of increasing the FPS for
smoothness.  This will upset the animation speed for animated
backgrounds.
Seperated background scrolling and background animation.  Scrolling no
longer dependant on fps defined animation speed.
Scrolling background now wraps when the second image starts leaving the
screen.