Move room management from Controller to RoomManager

src/roommanager.cpp

@@ -191,7 +191,8 @@ void RoomManager::joinRoom(Quotient::Connection *account,
                           const QString &roomAliasOrId,
                           const QStringList &viaServers)
 {
-    // We already listen to roomJoined signal in the Controller
+    // This should trigger a signal in Quotient once done and NeoChat will
+    // react to it and open the newly joined room.
     account->joinRoom(QUrl::toPercentEncoding(roomAliasOrId), viaServers);
 }