Move the menu bar into its own file.

Source/Core/DolphinQt2/MenuBar.h

@@ -0,0 +1,30 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QMenu>
+#include <QMenuBar>
+
+class MenuBar final : public QMenuBar
+{
+	Q_OBJECT
+
+public:
+	MenuBar(QWidget* parent = nullptr);
+
+signals:
+	void Open();
+	void Exit();
+
+	void ShowTable();
+	void ShowList();
+
+private:
+	void AddFileMenu();
+	void AddViewMenu();
+
+	void AddGameListTypeSection(QMenu* view_menu);
+	void AddTableColumnsMenu(QMenu* view_menu);
+};