Various experiments in lo-res graphics

+ boxes
	makes lores pictures by drawing boxes

+ checkers
	some attempts at 32B graphics

+ drops
	raindrops

+ mode7
	mode7 tests, used when making mode7 demo

+ rasterbars
	colored bars (not really rasterbars), used in mode7 demo

+ rotozoom
	rotozoom, used in tfv

+ scroll_text
	some lo-res scroll text

+ sier
	zooming sierpinski

+ starfield
	lo-res starfield

