Splitt PowerOff into own class

Add inital AlarmSettingsDialog (not used so far)

power.h

@@ -0,0 +1,17 @@
+#ifndef POWER_H
+#define POWER_H
+
+#include <QObject>
+
+class Power : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Power(QObject *parent = nullptr);
+
+signals:
+
+public slots:
+};
+
+#endif // POWER_H