Added window icon (and others). Plus minor fixes.

mainwindow.cpp

@@ -9,6 +9,18 @@ MainWindow::MainWindow(QWidget* parent)
   ui->setupUi(this);
 
   m_core = std::make_shared<GenericCore>();
+
+  /// application icon
+  const QString iconString = "://feature.png";
+#ifdef QT_DEBUG
+  QPixmap pixmap       = QPixmap(iconString);
+  QTransform transform = QTransform();
+  transform.rotate(180);
+  QPixmap rotated = pixmap.transformed(transform);
+  setWindowIcon(QIcon(rotated));
+#else
+  setWindowIcon(QIcon(iconString));
+#endif
 }
 
 MainWindow::~MainWindow() { delete ui; }