QmlDesigner.FormEditor: Add name method to custom tools

Change-Id: Icabf454fc49444a5a88c1f5eb84847967f09078e
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmldesigner/components/formeditor/abstractcustomtool.h

@@ -12,6 +12,8 @@ public:
 
     void selectedItemsChanged(const QList<FormEditorItem *> &itemList) QTC_OVERRIDE;
 
+    virtual QString name() const = 0;
+
     virtual int wantHandleItem(const ModelNode &modelNode) const QTC_OVERRIDE = 0;
 };