Includes, comments and bugfixes

- Fix includes
- Use common regex (Song::kCoverRemoveDisc) for removing Disc/CD from album
- Remove Disc/CD from album when creating hash
- Make imobiledevice support compile
- Fix setting device on windows

src/widgets/stickyslider.h

@@ -23,8 +23,12 @@
 
 #include "config.h"
 
+#include <QObject>
+#include <QWidget>
 #include <QSlider>
 
+class QMouseEvent;
+
 class StickySlider : public QSlider {
   Q_OBJECT
   Q_PROPERTY(int sticky_center READ sticky_center WRITE set_sticky_center);