Revise *status and *controlpanel help output

The list of available commands is quite exhausting. These changes make it possible for users to filter the help output.
> Would you prefer to reduce the output so that the variables will be output only when the command matches ie. "help" or "help s" won't list any variables?

With this idea the result of "help set" looks a bit inconsistent. It lists commands [Set, SetChan, SetNetwork] but variables only for Set.