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.cpp

@@ -20,8 +20,13 @@
 
 #include "config.h"
 
+#include <QWidget>
+#include <QSlider>
+
 #include "stickyslider.h"
 
+class QMouseEvent;
+
 StickySlider::StickySlider(QWidget *parent)
   : QSlider(parent),
     sticky_center_(-1),