Code cleanup: implement window title update via signal

This seems quite convoluted to me but I can't seem to make a more straight
forward implementation work. The idea is that core code should never
directly call into the UI.

So instead the core code (this is C code) calls a helper function. That
helper function calls a member function of a class which in return emits a
signal. The UI code connects to that signal and acts accordingly when it
is received.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

windowtitleupdate.h

@@ -0,0 +1,20 @@
+#ifndef WINDOWTITLEUPDATE_H
+#define WINDOWTITLEUPDATE_H
+
+#include <QObject>
+
+class WindowTitleUpdate : public QObject
+{
+	Q_OBJECT
+public:
+	explicit WindowTitleUpdate(QObject *parent = 0);
+	~WindowTitleUpdate();
+	static WindowTitleUpdate *instance();
+	void emitSignal();
+signals:
+	void updateTitle();
+private:
+	static WindowTitleUpdate *m_instance;
+};
+
+#endif // WINDOWTITLEUPDATE_H