Game server: fixes a bug with the weapon delay check (inconsistency with what the client sent) which caused a few weapons to fail when using normally.
Game server: revised the 2h item check.
Game server: removed a forgotten to-do comment (long since implemented).
Game server: implemented BUFF_TYPE_IGNORE_WEAPON (not sure how accurate to official it is... it always seems to removes both weapons client-side, so went with the client there); refs #229, resolves #220.