Unfucks zombies

Created by: Skullyton

Removes the do_after, as it was causing everything to wait for that zombie to finish eating.

Redoes target acquisition all through the regular hostile mob target acquisition, to save on that RAM and not make another new list every life tick of every zombie.

Zombies now attack lights, this will lead to odd behaviour.

Also, because evil necromancy magic and the creator variable was not being used anywhere, zombies should not be able to attack their creator as human-controlled or not, saving a lot of asspain.