Ether Gems

• Remove unused gem attributes
• Fix crystal creation error
• Remove slotted equipment from creative inventory
• Update Forge Version to 1.15.2-31.2.5
• Add Polymorph as a full dependency
• Allow sharing of gems
• Always show slots in Gem Container
• Prevent others from accessing Ether Furnace on use
• Add attribute to Electric Crystal to prevent crash
• Activate equipment gems on respawn
• Remove variation in crystal level
• Use data pack for Ether Deposit item drops
• Update Blaze effect timer

Gem improvements to: * Spike Defence * Back Attack Plus * Critical Up * Auto-Heal Up * Aquatic, Aerial, and Earth Cloak * Blaze, Chill, Poison, and Bleed Defence * Poison Plus * Debuff Resist