Add option to always show participants in MUC

[boothj5]

Currently the room members are shown upon entering a room, and available at any time via the /who command.

Allow an option to show room participants, possibly by splitting the main window.

[bfiorini]

Would love to see this ! 👍

[tinfoil-globe]

👍

[boothj5]

This has now been added in master.

The list of occupants is broken down by role (Moderator, Participant, Visitor). The occupants panel is shown by default. To hide the panel:

/occupants hide

To show the panel:

/occupants show

To change the default for whether or not to show the panel when entering a new room:

/occupants default show
/occupants default hide

If the list goes off the bottom of the screen, shift-down and shift-up should page through it.