Renew the updater branch

Now with some actual consensus on what the updater will do!

mmc_updater/src/UpdateDialogGtkFactory.h

@@ -0,0 +1,13 @@
+#pragma once
+
+class UpdateDialog;
+
+/** Factory for loading the GTK version of the update dialog
+ * dynamically at runtime if the GTK libraries are available.
+ */
+class UpdateDialogGtkFactory
+{
+	public:
+		static UpdateDialog* createDialog();
+};
+