Renew the updater branch

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

mmc_updater/src/UpdateDialogGtk.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include "UpdateDialog.h"
+#include "UpdateMessage.h"
+#include "UpdateObserver.h"
+
+#include <gtk/gtk.h>
+
+class UpdateDialogGtk : public UpdateDialog
+{
+	public:
+		UpdateDialogGtk();
+
+		// implements UpdateDialog
+		virtual void init(int argc, char** argv);
+		virtual void exec();
+		virtual void quit();
+
+		// observer callbacks - these may be called
+		// from a background thread
+		virtual void updateError(const std::string& errorMessage);
+		virtual void updateProgress(int percentage);
+		virtual void updateFinished();
+
+	private:
+		static void finish(GtkWidget* widget, gpointer dialog);
+		static gboolean notify(void* message);
+
+		GtkWidget* m_window;
+		GtkWidget* m_progressLabel;
+		GtkWidget* m_finishButton;
+		GtkWidget* m_progressBar;
+		bool m_hadError;
+};
+
+// helper functions which allow the GTK dialog to be loaded dynamically
+// at runtime and used only if the GTK libraries are actually present
+extern "C" {
+	UpdateDialogGtk* update_dialog_gtk_new();
+}
+
+