2.9.0

• added "spellengineextension:has_conditional_spell_container" item component, which can be used to disable the spell container of an item, depending on the hand it's held in (supports RPG Inventory)
• added "spellengineextension:proxy_pool" item component, which can be used to limit what spells a spell casting item can cast
• added config option to limit the types of spells that can be in the 'use key' spell hotbar slot (using spell tier)