QmlDesigner.PropertyEditorView: use forward declaration

This reduced dependecies.

Change-Id: I064a9f4ef953196a301b4fdd194db2370efcfba1
Reviewed-by: Marco Bubke <marco.bubke@digia.com>

src/plugins/qmldesigner/components/propertyeditor/propertyeditorview.cpp

@@ -29,8 +29,11 @@
 
 #include "propertyeditorview.h"
 
-#include <qmldesignerconstants.h>
+#include "propertyeditorqmlbackend.h"
+#include "propertyeditorvalue.h"
+#include "propertyeditortransaction.h"
 
+#include <qmldesignerconstants.h>
 #include <nodemetainfo.h>
 
 #include <invalididexception.h>
@@ -42,9 +45,6 @@
 #include <nodeabstractproperty.h>
 #include <rewriterview.h>
 
-#include "propertyeditorvalue.h"
-#include "propertyeditortransaction.h"
-
 #include <utils/fileutils.h>
 
 #include <QCoreApplication>

src/plugins/qmldesigner/components/propertyeditor/propertyeditorview.h

@@ -34,7 +34,6 @@
 #include <QHash>
 #include <QTimer>
 
-#include "propertyeditorqmlbackend.h"
 #include "propertyeditorwidget.h"
 
 QT_BEGIN_NAMESPACE
@@ -49,6 +48,7 @@ class PropertyEditorTransaction;
 class CollapseButton;
 class PropertyEditorWidget;
 class PropertyEditorView;
+class PropertyEditorQmlBackend;
 
 class PropertyEditorView: public AbstractView
 {