Nice Mob Variants

Changes:

• Added Husk Zombie Nautilus variant (Spawns in the same biomes as warm ocean ruins generate. Doesn't burn in sunlight)
• Added Guardian Zombie Nautilus variant (Spawns in the same biomes as Ocean Monuments generate)
• Added Creaking Frog variant (Can be bred/spawns in Pale Gardens. Drops Pale Moss Blocks when eating)
• Added Golden Frog variant (Can be bred/spawns in Badlands Biomes. Drops commonly Raw Gold or rarely Emeralds when eating)
• Frogs can now eat Silverfish and Endermite
• Silverfish have a chance to drop Gravel on player kill
• Endermite have a chance to drop Ender Pearl on player kill