Enderchests are now cached, performance should be a lot better for big enderchests.
Added a new config option, you can now block the losing of items, it will prevent users from opening their enderchest until they regain the correct permission. (enabled by default)
New Usermap built-in, should work for geyser compat (even for offline player)
Admins can now modify the enderchests using the exsee command
Updated for 1.21 (tested only on 1.21.4, but should work fine for all 1.21)