Piglin Proliferation

CHANGELOG:

• [CHANGE] - Changed 'in water' wording in buckler description to 'if wet' to prevent further confusion
• [CHANGE] - fix #45 (effects like poison, wither, and regeneration not applying properly for alchemist fire rings)
• [CHANGE] - fix #50 (rare crash where crossbow alchemist piglins can't find a target upon zombification)
• [CHANGE] - nerf spawn size for alchemists and potion drop chance
  • spawn size is 1 to 3 instead of 3 to 6
  • chance to drop potions is 0.5% instead of 20%