Popup for showing the current operation and new app icon

This MR brings the following features;

• fix: bring the popup back for giving feedback to the user
• add: new icons for the app

src/backend/dsconnector/ds.cpp

@@ -15,7 +15,6 @@ DesignStudio::DesignStudio(QWebSocket *socket, const QString &m_deviceUuid, QObj
     initPingPong();
     initSocket();
 
-    qDebug() << "Starting ping timer" << m_id;
     m_pingTimer.start();
 }
 
@@ -42,6 +41,8 @@ void DesignStudio::initPingPong()
     connect(&m_pongTimer, &QTimer::timeout, this, [this]() {
         qDebug() << "Design Studio" << m_id << "is not responding. Closing the connection.";
         m_socket->close();
+        m_socket->abort();
+        emit disconnected(m_id);
     });
 }