Feature request - Option to guarantee X is not in pool

[ahhh-reptar]

As much as I love doing ability pool randomization, it kinda sucks when you get like 4 EXP Zeros or whatever. It'd be nice to tell the randomizer to completely remove these from the pool of checks.

This could be expanded to other things as well, potentially everything but proofs. But mostly I see this as a way of stopping horrible support ability randomization.