Add missing #include <qdatastream.h> or <qiodevice.h>

Lots of code depended on an indirect includes from qstringlist.h.

Change-Id: I33d0dce33d64302d6c0e49180cc1249b90ab27c5
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

src/corelib/io/qsettings.cpp

@@ -54,6 +54,7 @@
 #include "qlibraryinfo.h"
 #include "qtemporaryfile.h"
 #include "qstandardpaths.h"
+#include <qdatastream.h>
 
 #ifndef QT_NO_TEXTCODEC
 #  include "qtextcodec.h"

src/corelib/kernel/qmetatype.cpp

@@ -52,6 +52,7 @@
 #include "qeasingcurve.h"
 #include "quuid.h"
 #include "qvariant.h"
+#include "qdatastream.h"
 #include "qmetatypeswitcher_p.h"
 
 #ifndef QT_BOOTSTRAPPED

src/corelib/tools/qregularexpression.cpp

@@ -51,6 +51,7 @@
 #include <QtCore/qthreadstorage.h>
 #include <QtCore/qglobal.h>
 #include <QtCore/qatomic.h>
+#include <QtCore/qdatastream.h>
 
 #include <pcre.h>
 

src/corelib/tools/qtimezone.cpp

@@ -43,6 +43,7 @@
 #include "qtimezone.h"
 #include "qtimezoneprivate_p.h"
 
+#include <QtCore/qdatastream.h>
 #include <QtCore/qdatetime.h>
 
 #include <qdebug.h>

src/corelib/tools/qtimezoneprivate.cpp

@@ -44,6 +44,7 @@
 #include "qtimezoneprivate_p.h"
 #include "qtimezoneprivate_data_p.h"
 
+#include <qdatastream.h>
 #include <qdebug.h>
 
 QT_BEGIN_NAMESPACE

src/corelib/tools/qtimezoneprivate_tz.cpp

@@ -44,6 +44,7 @@
 
 #include <QtCore/QFile>
 #include <QtCore/QHash>
+#include <QtCore/QDataStream>
 #include <QtCore/QDateTime>
 
 #include <qdebug.h>

src/gui/image/qimageiohandler.h

@@ -42,6 +42,7 @@
 #ifndef QIMAGEIOHANDLER_H
 #define QIMAGEIOHANDLER_H
 
+#include <QtCore/qiodevice.h>
 #include <QtCore/qplugin.h>
 #include <QtCore/qfactoryinterface.h>
 #include <QtCore/qscopedpointer.h>

src/gui/image/qpicture.h

@@ -42,6 +42,7 @@
 #ifndef QPICTURE_H
 #define QPICTURE_H
 
+#include <QtCore/qiodevice.h>
 #include <QtCore/qstringlist.h>
 #include <QtCore/qsharedpointer.h>
 #include <QtGui/qpaintdevice.h>

src/network/access/qnetworkdiskcache.cpp

@@ -48,6 +48,7 @@
 
 #include <qfile.h>
 #include <qdir.h>
+#include <qdatastream.h>
 #include <qdatetime.h>
 #include <qdiriterator.h>
 #include <qurl.h>