Implemented working clip animation for deer

Added a new function to draw the blank deer.  Instead of requiring
a seperate image file for each frame of the "draining" deer
animation, this function just creates a clipping area defined by
an array initialized on load.  Then the background image is drawn
into just this clipping area, giving the same end result as the
original animation.  Once I do the same thing for the fill animation
(with the same "clipping region" array that I have), then I won't
need the deer animation frame images at all (should speed up the
page loading times - the fewer actual images I have to load on start
up the better).