Update to 1.21.5! No longer depends on CITResewn, has a soft dependency on the item regex mod.

We refactored ALL the elytras to work with just ETF/EMF!! This radically different system is the reason for the version number bumbing to 5.0

Other Additions:

• Contrail Elytra Rename (add "contrail" to any non-remodeled elytra!)
• Blue Crab Elytra