(Hotfix) Added advancements for the new dungeon and exploration maps leading to it

• Removed the Mining System
• Added the Mining Complex. This new structure is a complete rework of the old Mining System, and features many improvements. An outpost of the Mechanical Nest can be found in the surface, leading down into the mines.
• All loot in the Mining Complex has been reworked, including new barrels, vaults and keys. Two enchantments of this mod can now be found in these vaults: Discharge and Voltaic Shot.
• Technical changes around Keep Kayra to allow for easier ports in the future.