Change signature of AbstractView::nodeSlidedToIndex in QmlDesigner

The usage of 'int newIndex' was ambiguous in the case of
oldIndex < newIndex. Solved by directly passing the ModelNode that was
moved around.

'nodeSlidedToIndex' was also renamed to 'nodeOrderChanged', since
'Slided' is no proper English.

src/plugins/qmldesigner/components/integration/componentview.h

@@ -72,7 +72,7 @@ public:
 
     void fileUrlChanged(const QUrl &oldUrl, const QUrl &newUrl);
 
-    void nodeSlidedToIndex(const NodeListProperty &listProperty, int newIndex, int oldIndex);
+    void nodeOrderChanged(const NodeListProperty &listProperty, const ModelNode &movedNode, int oldIndex);
 
     void importsChanged();