Zombie Villager Variants

Several fixes:

• The Drowned Villager's model no longer clips through its clothes
• The optional Bouldering and Jungle Zombie Villagers no longer have sunlight immunity
• The optional Frozen and Lobber Zombie Villagers' projectiles are now in the #minecraft:impact_projectiles tag like they are supposed to be.
• Conflicts with similarly named mixins in other mods should be resolved