Do not use deprecated Qt functionality.

Replace all* remaining deprecated Qt 4 functions with
their Qt 5 counterparts. This means we no longer need to
define the QT_DISABLE_DEPRECATED_BEFORE macro.
This patch is relatively small because most source-compatible
changes of this kind have been done before.

* The one exception is the QmlDesigner, which uses QWeakPointer
in a deprecated way all over the place.

Change-Id: Id4b839c6685f3b5bdf2b89137f95231758ec53c7
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/libs/utils/pathchooser.cpp

@@ -37,10 +37,10 @@
 #include "hostosinfo.h"
 
 #include <QDebug>
-#include <QDesktopServices>
 #include <QFileDialog>
 #include <QHBoxLayout>
 #include <QPushButton>
+#include <QStandardPaths>
 
 /*!
     \class Utils::PathChooser
@@ -594,7 +594,7 @@ QString PathChooser::homePath()
     // does not let people actually display the contents of their home
     // directory. Alternatively, create a QtCreator-specific directory?
     if (HostOsInfo::isWindowsHost())
-        return QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
+        return QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
     return QDir::homePath();
 }