Add JoinRoomSettings, LeaveRoomSettings, and RoomMessageSettings

xmpp/ChangeLog

@@ -1,8 +1,12 @@
 Version NEXT
 XXXX-YY-ZZ [ RELEASER <admin@localhost> ]
-    * Breaking chagnes:
+    * Breaking:
       - Event::LeaveRoom, Event::LeaveAllRooms, and Event::JoinRooms have been removed.
         Agent now handles MUC connection states internally. (!481)
+      - Agent::leave_room now takes LeaveRoomSettings argument (!483)
+      - Agent::join_room now takes JoinRoomSettings argument (!483)
+    * Added:
+      - Agent::send_room_message takes RoomMessageSettings argument (!483)
     * Fixes:
       - Use tokio::sync::RwLock not std::sync::RwLock (!432)
       - Agent::wait_for_events now return Vec<Event> and sets inner tokio_xmpp Client