Remove direct member m_hw, a pointer to the device-controller-plugin.

The worker shall not load the plugin, otherwise it would block itself inside
an QT slot.

worker.h

@@ -74,16 +74,20 @@ class hwinf;
 class Worker : public QObject {
     Q_OBJECT
 
-    hwinf *m_hw;
     WorkerThread m_workerThread;
     int const m_customerNr;
     QString const m_customerNrStr;
     int const m_machineNr;
     int const m_zoneNr;
+    QString const m_pluginName;
     QString const m_workingDirectory;
     QString const m_branchName;
     QString const m_customerRepositoryPath;
     QString const m_customerRepository;
+    bool const m_dryRun;
+    QObject *m_parent;
+    QString const m_serialInterface;
+    QString const m_baudrate;
     Update *m_update;
     IsmasClient m_ismasClient;
     GitClient m_gc;
@@ -130,11 +134,11 @@ public:
     static const QString UPDATE_STEP_FAIL;
     static const QString UPDATE_STEP_SUCCESS;
 
-    explicit Worker(hwinf *hw,
-                    int customerNr, // 281
+    explicit Worker(int customerNr, // 281
                     int machineNr,
                     int zoneNr,
                     QString branchName,
+                    QString pluginName,
                     QString workingDir = ".",
                     bool dryRun = false,
                     QObject *parent = nullptr,
@@ -143,6 +147,8 @@ public:
     ~Worker();
 
     void setMainWindow(MainWindow *mainWindow) { m_mainWindow = mainWindow; }
+    hwinf *getPlugin();
+    hwinf const *getPlugin() const;
     void setProgress(int progress);
     void startProgressLoop();
     void stopProgressLoop();