Rewrite gfxx bit handling

Specifies how many bits for each of "alpha" (ignored), red, green, blue.
Separates byte-order and bit-order. Much more flexible, but now won't
render CARDS.DLL graphics properly due to the skip bit being not where
it expects.

Also mmaps the file instead of reading it all in. And the default
palette and sampling got removed again for now, since it's too awkward
to use.

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