'Hook method. Used for formatting external messages. This is
needed as a separate operation because the senders of external
messages may not be in-game objects/players, and so cannot
have things like custom user preferences.
Args:
msgobj (Msg or TempMsg): The message to send.
senders (list): Strings, one per sender.
emit (bool, optional): A sender-agnostic message or not.
Returns:
transformed (str): A formatted string.'

def format_external(self, msgobj, senders, emit=False):

    if (emit or (not senders)):
        return msgobj.message
    senders = ',    '.join(senders)
    return self.pose_transform(msgobj, senders)
