Remove old shapeConfigWidget usage and add new one.

The shape configureation concept before was mixing 3 usecases and
overly complex and to be honest, it failed at being sufficient for
2 out of 3 usecases.

This change makes the KoShapeConfigWidgetBase a lot more simple
and only for the usecase where a shape provides a configuration option
to a generic tool (as opposed to having a new specialized tool).