Makes a class. (costs 100 crowns)
You can @lock rooms, players, exits and objects to classes,
which prevents people from "using" them unless they are a
member of the class listed in the lock. Classes can be
locked to or against other classes, preventing players
in undesirable or incompatible groups from joining in.
EXITS can be used to add/remove players from groups, by
Adding them to the desired group they will toggle the
players status with that group, when the user successfully
uses the exit.