Clean headers in QML-Designer.

Ran script to remove inludes on a trial-and-error basis and
manually corrected it.

Change-Id: I8a2e9e35980198fc4162623db044c228bd209a0f
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmldesigner/components/formeditor/dragtool.cpp

@@ -31,17 +31,13 @@
 
 #include "formeditorscene.h"
 #include "formeditorview.h"
-#include "formeditorwidget.h"
-#include "itemutilfunctions.h"
 #include <customdraganddrop.h>
 #include <metainfo.h>
 #include <rewritingexception.h>
 
-#include "resizehandleitem.h"
-
-#include <QApplication>
 #include <QGraphicsSceneMouseEvent>
 #include <QDebug>
+#include <QMimeData>
 #include <QMessageBox>
 #include <QTimer>