Preview v2021: fill section with color of geometry

3DViewStation has several options to display sections of geometries. Per default we calculate a wire of the section contour, displayed in a single color, yellow. You might decide to use the individual color of the sectioned part instead. When filling the sections, so far we only allowed to use one color, default is yellow again. With v2021 we also allow to use the individual color of the sectioned part in order to fill the section. The result can also be exported, to vector or image file formats.