Add permissions API support.
- Add 'use_permissions_api' config option. Default false.
- Add util class ECPerms to enable the aforementioned perms toggle. (Wraps permissions.require)
- Add permissions requirements for all commands (and default values if perms disabled)
- Add 'fabric-permissions-api-v0' dependency.
Bugfixes/Minor improvements:
- Add "could not be deleted" error message for '/warp delete' if warp does not exist.
