UI: Implement a command line option to boot NAND title

Source/Core/DolphinQt2/MainWindow.h

@@ -35,7 +35,7 @@ class MainWindow final : public QMainWindow
   Q_OBJECT
 
 public:
-  explicit MainWindow();
+  explicit MainWindow(std::unique_ptr<BootParameters> boot_parameters);
   ~MainWindow();
 
   bool eventFilter(QObject* object, QEvent* event) override;