Add and use m_updateSteps.

UpdatePTUDevCtrl/mainwindow.h

@@ -4,6 +4,8 @@
 #include <QMainWindow>
 #include <QTimer>
 #include <QStatusBar>
+#include <QVector>
+#include <QString>
 
 QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
@@ -97,5 +99,8 @@ private:
     QTimer *m_statusTimer;
     QString m_targetDcVersion;
     int m_stepLabelChopCount{};
+
+    QVector<QString> m_updateSteps{};
+
 };
 #endif // MAINWINDOW_H