Support command wrapping and unwrapping

[virustotalop]

CommandMap map;

Command original = map.get("test");
if(original != null) {
	map.put("test", new Command() {
		public void command(sender, command, label, args) {
			if(args.length == 0) {
				//execute registered command
			} else {
				original.command(sender, command, label, args);
			}
		}
	});
} else {
	//Just register regular command
}

If a command is wrapped on unregister it should unwrap.