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MUC: Add support for presence probes (fixes #1535) The following patch allows Prosody to respond to `probe` presences and send out the probed occupant's current presence. This is based on line 17.3 in XEP-0045: A MUC service MAY handle presence probes sent to the room JID <room@service> or an occupant JID <room@service/nick> (e.g, these might be sent by an occupant's home server to determine if the room is still online or to synchronize presence information if the user or the user's server has gone offline temporarily or has started sharing presence again, as for instance when Stanza Interception and Filtering Technology (XEP-0273) is used).

This file documents the structure of the roster object.

table roster {
  [string bare_jid] = roster_item
}

table roster_item {
  string subscription = "none" | "to" | "from" | "both"
  string name = Opaque string set by client. (optional)
  set groups = a set of opaque strings set by the client
  boolean ask = nil | "subscribe" - a value of true indicates subscription is pending
}

The roster is available as
 hosts[host].sessions[username].roster
and a copy is made to session.roster for all sessions.

All modifications to a roster should be done through the rostermanager.