MMR - Moog's Mineshafts Reimagined

First alpha release of Moog's Mineshafts Reimagined.

Added

• Six biome-specific reimagined mineshafts: base (taiga and similar overworld biomes), desert, jungle, mesa, snowy, and nether.
• Hand-built jigsaw tunnels and rooms made from vanilla blocks and entities, with loot, mob spawners, and feature rooms.
• Themed loot variants for supply barrels, miner chests, and treasure so containers vary between rooms, plus vaults and trial spawners.