Clean up _PIT.OPCODES
Clean up _PIT.OPCODES

No more subtraction to get the right opcode.  Instead we use mnemonics.  No more weird array of a bunch of different things; instead one array.

Worth noting that d2f previously had the wrong output (casted to double instead of float) and the compare familly didn't indicate NaN behavior.

Pokechu22/Burger,mcdevs/Burger