Support for 2D packing

Hi Yannis, 

and thank you for a very good plugin.

I've used Packrat for simple nesting of curve profiles for laser cutting. Due to the shape of the objects, the boundingbox approach for the nesting has worked well for me. The only discomfort I'm having is the need to extrude the profiles into 3D objects in order to nest them. This causes some computational restrictions on a large set.

Could it be possible to implement a support for 2D packing as well? It would be great if the plugin could understand Gh groups (Transform-Util-Group), so the curve profiles and text-line coding can be packed together, while maintaining their original relational placements. Planar surface can be used to "group" inner holes, but the coding lines do not "stick" to surfaces.

And while I'm describing needs, hopes and wishes, an option for object rotation in the packing would be greatly appreciated (90 degrees - as dealing with bounding boxes). Depending on materials ja curve profiles, sometimes you cannot rotate curves for nesting, and other times the pieces would fit more nicely if some were rotated.

Once again, thank you for a great plugin!