Quick Elytra Reborn

Fixed a few bugs with the config
Added some new config options:

• Swap fireworks to your offhand automatically while gliding with an elytra, being switched back on landing
• Configure a list of which elytra items will be scanned on swapping an elytra
• Configure a list of which offhand items will be scanned on performing the offhand swap
• Configure a list of valid firework items for the automatic firework swap