Further zombie improvements and poking

Created by: Skullyton

Properly caps zombie health gain on consumption, also ups it as the received health was not worth the hassle.

Fixes the NPC zombies having sanik goto

Fixes player controlled zombies from trying to eat living humans.

Ups the chance of non-crimson zombies opening doors, from 15% chance to 33% chance

Adds a verb for player-controlled zombies to check if they can potentially evolve