Route SDL palette changes through SDL_SetPalette()

This is apparently the correct way to do things, since SDL wants to
know when the palette changes in order to recalculate certain
internal things. We should probably also add a setMany() method or
something on PaletteInterface to do this efficiently.
 # Please enter the commit message for your changes. Lines starting
Remove rdfull.but

This results in a significant reduction of BigHardMe(), but it still
also looks at LIFTOFF.ABZ, which hasn't been PNGified yet. Sigh.

Incidentally, this also closes #107.