CongCommandHistory
@congcommandhistory: the object which received the signal.
@obj:
@klass:
@obj:
@Returns:
@command_history:
@Returns:
@Returns:
@command_history:
@command:
@command_history:
@Returns:
@command_history:
@Returns:
@command_history:
@command_history:
@command_history:
@Returns:
@command_history:
@Returns: