[Pidgin] #15767: Add disco#roominfo support to XMPP MUC room list

[Pidgin]

#15767: Add disco#roominfo support to XMPP MUC room list
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 Reporter:  n8felton     |      Owner:  deryni
     Type:  enhancement  |     Status:  new
Milestone:  3.0.0        |  Component:  XMPP
  Version:  2.10.7       |   Keywords:  XMPP MUC
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 Currently when loading a room list for an XMPP MUC, only "disco#items" is
 queried, limiting the information listed in the room list to the room's
 JID and Name.

 I would like to see Pidgin use "disco#roominfo" to get more details about
 the rooms such as the proper description (muc#roominfo_description, not
 just using the name of the room for a description), current room topic
 (muc#roominfo_subject), and number of current occupants
 (muc#roominfo_occupants). These extra details would then become additional
 columns in the room list when querying for available MUCs on an XMPP
 server.

 Additionally, properly naming the columns what they are referencing would
 be nice. Currently, "Name" is the node portion of the JID, and the
 "Description" column is the name attribute of the item. I would like to
 see a JID column with the actual JID, and have the "Name" column be the
 actual name attribute of the item.

 Reference: http://xmpp.org/extensions/xep-0045.html#disco-roominfo

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Ticket URL: <https://developer.pidgin.im/ticket/15767>
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