Handle duplicate palette entries #4157
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Stop using
IdMapperbecause it can't map two ids to the same block. This should never happen but apparently Minecraft doesn't care about Mojang fixing bugs.I also made
GlobalPalettea special case because not usingIdMapperanymore means we'd have to copy the entire registry in order to avoid the special case and there is a huge speed difference between scanning all blockstate ids for a handful of states vs. looking up the ids of those states in a hash map.Should fix #3917