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

ext/libstrawberry-common/core/workerpool.cpp

@@ -15,6 +15,8 @@
    along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <QObject>
+
 #include "workerpool.h"
 
 _WorkerPoolBase::_WorkerPoolBase(QObject *parent) : QObject(parent) {}