Presences with sleekxmpp

[sleduc]

To store "who is present or not in a room" we currently use a structure similar to a dictionary (Occupants in pipobot.lib.users). The module RecordUser (defined in pipobot.lib.modules) is listening to XMPP presence messages and updating it.

Sleekxmpp muc module is able to provide all these informations (and more !) natively : see
https://github.com/fritzy/SleekXMPP/blob/develop/sleekxmpp/plugins/xep_0045.py
Sleekxmpp is handling MUC presence, keeping tracks of nicknames/jid/roles/…

Nevertheless current "Occupant" structure is important for testing modes (interract, script, unittest…) but could be simplified/optimized in the case of XMPP MUCs.