[plt-scheme] tetris

I thought the recently uploaded tetris game to planet was fun so I
converted it to use the Allegro package instead of htdp. Theres not
really much of a point and its not like it runs better or anything, but
it was good to compare htdp's functional style with Allegro's mostly
imperative style. It probably won't work too well in osx.

Tetris on planet:
http://planet.plt-scheme.org/display.ss?package=tetris.plt;owner=dvanhorn

Code attached if you want to try it.
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