Property changes from ScenegraphLoaderUtils.listen do not trigger redrawing of nodes

The problem can be seen e.g. when changing text in TextNodes within drawing template. Updates are shown only when user e.g. zooms the diagram.

Additionally old listeners don't get cleaned up and keep old versions of nodes alive. This happens for example in DrawingTemplateStyle.applyStyleForItem which removes the old nodes and creates new ones on every change.