Add items to roster from iq of "set" type

Dependencies

• [2] SU4DNVCB Start to processing roster data
• [3] 5IKA4GO7 Rename xmpp client field from "inner" to "client"
• [4] BWDUANCV Second part of processing result is only about stop_future
• [5] EBETRYK7 Add counter for id. Check for jid in roster
• [*] VS6AHRWI Move XMPP to separate dir

Change contents

• replacement in src/xmpp/mod.rs at line 125
  [3.783]→[3.783:797](∅→∅)
  − self,
  [3.783]

  [3.797]
  + mut self,
• replacement in src/xmpp/mod.rs at line 134
  [2.548]→[2.548:641](∅→∅)
  − if let Some(_iq) = stanza.try_into().ok() as Option<xmpp_parsers::iq::Iq> {}
  [2.548]

  [2.641]
  + if let Some(iq) = stanza.try_into().ok() as Option<xmpp_parsers::iq::Iq> {

  + if let xmpp_parsers::iq::IqType::Set(element) = iq.payload {

  + if let Some(roster) =

  + element.try_into().ok() as Option<xmpp_parsers::roster::Roster>

  + {

  + self.state

  + .data

  + .roster

  + .extend(roster.items.into_iter().map(|i| (i.jid, ())));

  + }

  + }

  + }