New in this version:
- Added a config file: You can now disable any particular item in the config file. All settings are named enableEnderChest, enableGrindstone, etc
All are on by default except the new anvil support
Suggested by bonggil

- Added Anvil support: You can now open anvils from your inventory
Anvils do not take durability damage when opened this way like they do in the world, so this is an opt-in feature if you don't mind that. By default it is off, and can be enabled by setting enableAnvil to true in the new config file
Suggested by Folas1337

- Added permission support: You can now control who can open what using a permissions system
All permissions are named ultimateinventory.enderchest, ultimateinventory.grindstone, etc
To enable permission checks, set usePermissions to true in the new config file. By default it is false
If you don't do this, there are no permission restrictions, so server owners who don't use a permissions plugin don't need to set anything extra up
Suggested by Blzd

Please enjoy