Occluded Ghosts in Pacman

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Ghosts are occluded by the food after 1 episode. See the canvas.tkraise and canvas.lower of Tkinter on how to fix this.

[Will Dabney]

This is resolved in my latest commit (to the pull request). Added a method in graphicsUtils called raiseImage that does what it sounds like, and called it on the ghost image parts in move ghosts/eyes.