Dungeon overhaul!

- New BlockDungeonCore provides TileEntityDungeonCore, granting many
benefits
- Fairy Spawners now appear in some water dungeons; careful not to break
them, as they look just like stone!
- Chance of mountainous dungeons to spawn with water; these have the
highest chance of fairies!
- Only a certain number of fairies will spawn, needing time to
replenish; this varies per spawner
- Once the secret room has been revealed, remaining blocks may be broken
normally