New feature: the top left corner of the page lets you choose between final sprites and beta sprites!

The beta sprites were mostly redrawn by Dolphman. I revised some of them to better fit JJ1's dimensions--though I hope somebody steps up with a good freezing sprite for Nippius/Holidaius--and also I had to code my own MAINCHAR.000 compiler, because JJ1MOD wasn't optimizing things enough and that meant out-of-memory errors.