When Dungeons Arise

Added a new massive dungeon: Keep Kayra.

Reworked Mushroom Villages.

Implemented changes to structure sets to make them less likely to collide. Structures were internally grouped in 'minor' and 'major' structures, which cannot generate next to each other (minor structures always have a gap between them).

Removed "the_end" and "end_barrens" biomes from all end structures (they should no longer generate on the main end island)

Added some dungeons to Woodland Exploration maps which can be obtained by trading (Shiraz Palace, Keep Kayra, Foundry, Infested Temple, Plague Asylum).

Loot tables were changed or nerfed in a few structures, including ships, mushroom villages, illager forts, etc.

Structures generate more sparsely.

Fixed mining system loot tables - treasure and basic loot tables have been switched.

Fixed exploration maps appearing as empty maps on most structures.

Added more exploration maps (i.e.: abandoned_temple -> mining_system).

Removed Small Prairie Houses.