Move gamemode stuff to listener

- Fix messages in messages.yml not being used
- Fixed checkRank not working
- Added permissions support for tab handing

src/main/java/dev/plex/command/impl/PlexCMD.java

@@ -53,7 +53,7 @@ public class PlexCMD extends PlexCommand
         }
         else
         {
-            return usage(getUsage());
+            return usage();
         }
         return null;
     }