Move the various room models into RoomManager

Move the various room models into RoomManager. This means the same room models are always used and is a base from which further logic can be moved from QML to cpp.

src/runner.h

@@ -203,7 +203,7 @@ Q_SIGNALS:
 private:
     RemoteImage serializeImage(const QImage &image);
 
-    SortFilterRoomListModel m_model;
-    RoomListModel *m_sourceModel;
+    QPointer<RoomListModel> m_sourceModel;
+    QPointer<SortFilterRoomListModel> m_model;
     Runner();
 };