Forward declare some classes

src/gui/properties/propertieswidget.h

@@ -32,8 +32,6 @@
 #include <QList>
 #include <QWidget>
 
-#include "base/bittorrent/torrenthandle.h"
-
 class QPushButton;
 class QTreeView;
 
@@ -46,6 +44,11 @@ class PropTabBar;
 class TorrentContentFilterModel;
 class TrackerListWidget;
 
+namespace BitTorrent
+{
+    class TorrentHandle;
+}
+
 namespace Ui
 {
     class PropertiesWidget;