Fix custom texture archive palettes #1144
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There was an issue in txa generation where palettes were blindly copied from the png without regard to how many colors there are. This fixes that and generates a warning if the png has too many colours.
This issue didn't occur in matching builds because we split pngs with the correct palette size, but when modding this can break.
I also ported the size calculation from load_texture_by_name to make sure this sort of thing can't happen again 😁