ui: save and load view layout

* QtMainWindow now saves and loads its layout parameters.

src/app/qt/view/QtMainView.cpp

@@ -31,3 +31,13 @@ void QtMainView::removeView(View* view)
 	m_window->removeView(view);
 	m_views.erase(it);
 }
+
+void QtMainView::loadLayout()
+{
+	m_window->loadLayout();
+}
+
+void QtMainView::saveLayout()
+{
+	m_window->saveLayout();
+}

src/app/qt/view/QtMainView.h

@@ -19,6 +19,9 @@ public:
 	void addView(View* view);
 	void removeView(View* view);
 
+	virtual void loadLayout();
+	virtual void saveLayout();
+
 private:
 	std::shared_ptr<QtMainWindow> m_window;
 	std::vector<View*> m_views;