Return a message if someone makes faulty use of /setstatus

[lupadim]

If, for example, I use /setstatus casing instead of "casingopen" and "casingfull", show a message that says what are the possible arguments. Example: "Couldn't recognize status "casing". Try: "idle", "buildingopen", "buildilngfull", "casingopen", "casingfull""

[Lewdton]

Done