Add support for the "history" node on MUC join

Supports the "seconds", "maxstanzas", "since" and "maxchars" (but only =0)
attributes.

fix #3270

src/irc/irc_client.cpp

@@ -784,7 +784,7 @@ void IrcClient::on_channel_completely_joined(const IrcMessage& message)
   channel->joined = true;
   this->bridge.send_user_join(this->hostname, chan_name, channel->get_self(),
                               channel->get_self()->get_most_significant_mode(this->sorted_user_modes), true);
-  this->bridge.send_room_history(this->hostname, chan_name);
+  this->bridge.send_room_history(this->hostname, chan_name, this->history_limit);
   this->bridge.send_topic(this->hostname, chan_name, channel->topic, channel->topic_author);
 }