Add a pointer to the device-controller-plugin. The main window will always be

owned by the GUI thread, and the GUI thread is loading the plugin. Hence the
worker-thread does not block itself when inside a QT slot.

mainwindow.h

@@ -11,6 +11,7 @@ QT_END_NAMESPACE
 
 #include "worker.h"
 
+class hwinf;
 class MainWindow : public QMainWindow {
     Q_OBJECT
 
@@ -18,13 +19,15 @@ protected:
     void customEvent(QEvent *event) override;
 
 public:
-    MainWindow(Worker *worker, QWidget *parent = nullptr);
+    MainWindow(hwinf *hw, Worker *worker, QWidget *parent = nullptr);
     ~MainWindow();
 
     static const int START_PROGRESS_LOOP = -1;
     static const int STOP_PROGRESS_LOOP = -2;
 
     int progressValue() const { return m_progressValue; }
+    hwinf *getPlugin() { return m_hw; }
+    hwinf const *getPlugin() const { return m_hw; }
 
 public slots:
     void onAppendText(QString, QString suffix = "");
@@ -43,6 +46,7 @@ private:
     void scrollDownTextEdit();
 
     Ui::MainWindow *ui;
+    hwinf *m_hw;
     Worker *m_worker;
     int m_width;
     QTimer *m_startTimer;