Item duplication fix, database disconnect fix, 1.21.11 support
➕ Fixed a duplication issue when people closed the inventory without sendings packets (only possible with client modifications)
➕ The plugin no longer disables itself when the database connection fails or disconnects. Now it will enter a lock state where no chests can be opened until the connection is restored
➕ Added support for minecraft 1.21.11
➕ Fixed a bug where the option "return-to-menu-when-enderchest-closed" was not disabled in single mode