SSP import functionality

[larsviktorlarsson]

It would be practical to be able to import .ssp files into hopsan, and also run the from command line interface, e.g python.

[robbr48]

A problem I see is that geometry information is optional in SSP. I solution could be to somehow place the objects randomly, with diagonal connectors. Would this be an acceptable solution?

[robbr48]

After some more thinking I realized it might be better to just place all objects at (0,0) and let the user drag them to the correct location (and then save the new locations when saving the .ssp).