Renew the updater branch

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

mmc_updater/src/UpdateDialogAscii.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "UpdateDialog.h"
+
+#include <fstream>
+#include <thread>
+#include <mutex>
+
+/** A fallback auto-update progress 'dialog' for use on
+  * Linux when the GTK UI cannot be loaded.
+  *
+  * The 'dialog' consists of an xterm tailing the contents
+  * of a file, into which progress messages are written.
+  */
+class UpdateDialogAscii : public UpdateDialog
+{
+	public:
+		// implements UpdateDialog
+		virtual void init(int argc, char** argv);
+		virtual void exec();
+		virtual void quit();
+
+		// implements UpdateObserver
+		virtual void updateError(const std::string& errorMessage);
+		virtual void updateProgress(int percentage);
+		virtual void updateFinished();
+
+	private:
+		std::mutex m_mutex;
+		std::ofstream m_output;
+};
+