Adds 2 new structures!

Freezing Caves spawn in snowy biomes

• Freezing Caves have a higher chance to spawn the teddiursa line nearby and hisuian zorua

Piglin Graveyards spawn in the nether

• Piglin graveyards can spawn Gastly Line, Mimikyu, litwick, and hisuian zorua

Added Exp candies to a lot of loot tables!