* User can manually drag the elytra into their chestplate slot even when
it is locked, although this would display a log
* Locking the elytra now prevents fall flying if the user has it
equipped at the time of lock
* Made the elytra get removed from the chestplate slot when it is
locked, prevents user for dragging it into their chestplate when
locked too
* Renamed config.Util to config.ConfigUtil
* Added placeholder locked & unlocked elytra textures to resources