Remove /rq as an alias for /ragequit

As this shortcut doesn't describe the command and is commonly used to troll new players. Server owners can add an alias for the command if they still wish to allow /rq

MCGalaxy/Commands/other/QuitCmds.cs

@@ -24,7 +24,6 @@ namespace MCGalaxy.Commands.Misc
     public sealed class CmdRagequit : Command2 
     {
         public override string name { get { return "RageQuit"; } }
-        public override string shortcut { get { return "rq"; } }
         public override string type { get { return CommandTypes.Other; } }
         public override bool MessageBlockRestricted { get { return true; } }
         public override bool SuperUseable { get { return false; } }