Added support for displaying shape config widgets in the path tool options widget.
Added a pathShapeId() function to KoPathShape to return a specific path shape id.

As a start, I added a star shape config widget for editing the star properties.

If a single path shape is selected and the path tool is active an (existing) config widget for that shape is then shown in the tool options docker.

Next thing to do is to apply the config changes to the selected shape. And then to create some more config widgets for the other parameter shapes.