Structures Rebalanced

• Added 2 new templates to the Cobblestone Ruin
• Rebalanced Surface Mineshaft loot

• Cobblestone Ruin can no longer spawn in Windswept Hills
• Reduced spawn rate of Cobblestone Ruin
• Added templates to Abandoned Village (Plains)
  • Profession Houses
  • Churches
  • fish

• Abandoned villages now generate seperately from villages
  • This allows you to /locate them seperately from normal villages
• Improved abandoned Plains villages templates
• Reintroduced increased village seperation because I somehow deleted it at some point
• Added minimum seperation between some structures
• Fixed one Surface Mineshaft template's loot not generating

• New structure: Cobblestone Ruin
  • A couple of ruins from a while ago

Surface Mineshaft changes

• 4 new templates for the Surface Mineshaft
  • 2 ladder rooms
  • 1 storeroom
  • 1 barracks
• Reduced amount of coal blocks in coal_room_1
• Miscellaneous other fixes or changes for the Surface Mineshaft
• Attempted improvements at the air/water exposure patch
  • I don't understand why some sections of it just don't change the structure.

Other changes

• Updated pack description to show game version as 1.21
• Added appropriate liquid_settings for all Structures Rebalanced structures