ZenXArch's Zombie Apocalypse

Fixes

• Fixed a npe if zombie has null variant

Changes

• Zombies variants are more common now
• Zombies will try to ride chickens and parrots if the player is towering (only if chickens/parrots are close by)
• Default datapack is now optional (can be disabled)
• bit Cleaner code
• Zombies drop bones
• Zombies run when they acquire a target
• Night zombies are a bit slower

Changes to datapack

• Add weather related spawn conditions