Do not show core mods page for minecraft newer than 1.5.2.

gui/pages/ModFolderPage.h

@@ -61,3 +61,13 @@ private slots:
 	void on_rmModBtn_clicked();
 	void on_viewModBtn_clicked();
 };
+
+class CoreModFolderPage : public ModFolderPage
+{
+public:
+	explicit CoreModFolderPage(BaseInstance *inst, std::shared_ptr<ModList> mods, QString id,
+							   QString iconName, QString displayName, QString helpPage = "",
+							   QWidget *parent = 0);
+	virtual ~CoreModFolderPage(){};
+	virtual bool shouldDisplay();
+};