Extract RecentProjectsMenu class from MainWindow (#5148)

* Extract RecentProjectsMenu class from MainWindow
* Clean up updateRecentlyOpenedProjectsMenu
* Remove m_recentlyOpenedProjectsMenu from MainWindow

include/MainWindow.h

@@ -203,8 +203,6 @@ private:
 	QWidget * m_toolBar;
 	QGridLayout * m_toolBarLayout;
 
-	QMenu * m_recentlyOpenedProjectsMenu;
-
 	struct keyModifiers
 	{
 		keyModifiers() :
@@ -237,9 +235,7 @@ private:
 
 private slots:
 	void browseHelp();
-	void openRecentlyOpenedProject( QAction * _action );
 	void showTool( QAction * _idx );
-	void updateRecentlyOpenedProjectsMenu();
 	void updateViewMenu( void );
 	void updateConfig( QAction * _who );
 	void onToggleMetronome();

include/RecentProjectsMenu.h

@@ -0,0 +1,17 @@
+#ifndef RECENTPROJECTSMENU_H
+#define RECENTPROJECTSMENU_H
+
+#include <QMenu>
+
+class RecentProjectsMenu : public QMenu
+{
+	Q_OBJECT
+public:
+	RecentProjectsMenu(QWidget *parent = nullptr);
+
+private slots:
+	void fillMenu();
+	void openProject(QAction * _action );
+};
+
+#endif // RECENTPROJECTSMENU_H