Closed Issue: option to export selected items as separate modelvisual3d

We should have an option export selected objects in blender as individual modelvisual3d objects within the same scene. So one doesn't have to reasemmble the whole scene afterwards. This is especially cumbersome if you need to exactly repostion everything the way it was in the blender scene.
Comments: the latest version now supportes parent\children relationships with model3dgroup.