Charge Zombie new behavior. 1)Does not wreck chunks that are under a
certain air density. 2)Only destroys natural blocks when players are
nearby. 3)Has old block destroying behavior when fighting players.
Fix Charge Zombie III's not starting with full health.
Blocking provides 'Sturdy III' for players.
Fixed some issues with the Wither boss.
Traders now can give really good enchantments on tools and weapons.