Redo/Fix Invisibility

Currently Invisibility is useless. People can still see you because of your particles, armor, and held items. Even if you are holding nothing, have no armor on, and have particles off, hostile mobs STILL go after you. Invisibility is one of the coolest features, however in practice it's not very much fun.

Maybe displaying armor while invisible could be a game rule, that way it is customizable, so if you think having true invisibility is too OP, problem solved.

But at the VERY LEAST, hostile mobs should not be able to see you with or without armor.