Use Qt provided forward declaration header

src/base/bittorrent/session.h

@@ -41,6 +41,7 @@
 #include <QHash>
 #include <QPointer>
 #include <QSet>
+#include <QtContainerFwd>
 #include <QVector>
 
 #include "base/settingvalue.h"
@@ -58,7 +59,6 @@ class QFile;
 class QNetworkConfiguration;
 class QNetworkConfigurationManager;
 class QString;
-class QStringList;
 class QThread;
 class QTimer;
 class QUrl;

src/base/bittorrent/torrenthandle.cpp

@@ -31,6 +31,8 @@
 
 #include <type_traits>
 
+#include <QHash>
+
 namespace BitTorrent
 {
     uint qHash(const TorrentState key, const uint seed)

src/base/bittorrent/torrenthandle.h

@@ -29,15 +29,12 @@
 
 #pragma once
 
-#include <QHash>
 #include <QMetaType>
-#include <QSet>
 #include <QString>
-#include <QVector>
+#include <QtContainerFwd>
 
 class QBitArray;
 class QDateTime;
-class QStringList;
 class QUrl;
 
 namespace BitTorrent

src/base/bittorrent/torrentinfo.cpp

@@ -40,6 +40,7 @@
 #include <QString>
 #include <QStringList>
 #include <QUrl>
+#include <QVector>
 
 #include "base/exceptions.h"
 #include "base/global.h"

src/base/bittorrent/torrentinfo.h

@@ -32,14 +32,13 @@
 #include <libtorrent/torrent_info.hpp>
 
 #include <QCoreApplication>
-#include <QVector>
+#include <QtContainerFwd>
 
 #include "base/indexrange.h"
 
 class QByteArray;
 class QDateTime;
 class QString;
-class QStringList;
 class QUrl;
 
 namespace BitTorrent