added EnergySaver intended to handle shutdown.

Moved timer from MouseEventSpy to EnergySaver.
Connected MouseEventSpy and MusicController to EnergySaver.

LenaPi/EnergySaver.h

@@ -0,0 +1,30 @@
+#ifndef ENERGYSAVER_H
+#define ENERGYSAVER_H
+
+#include <QObject>
+#include <QTimer>
+
+class EnergySaver : public QObject
+{
+    Q_OBJECT
+
+protected:
+    EnergySaver(QObject *parent = 0);
+
+public:
+    static void init(int intervall);
+    static EnergySaver *instance();
+
+public slots:
+    void restartTimer();
+
+private:
+    void initTimer(int interval);
+    QTimer mTimer;
+
+private slots:
+    void onTimeout();
+
+};
+
+#endif // ENERGYSAVER_H