Support for freecad >0.16

[damides]

Hi,
I've tried running your software on Ubuntu 18.04 with FreeCad 0.18 but when I try to read a STEP file there is a problem in importing the FreeCad library.
I can't test version under 0.16 because there are no package available on the legacy ppa for Ubuntu 18.04.

Thank you!

[MPintoSpace]

Dear Damiano,
I'm sorry for taking so long to reply. Unfortunately I have been getting a lot of work and cannot really support GUIMesh a lot. 

I did a minor migration to python 3 with a few differences that can handle the new FreeCAD versions (it adds annoying objects that GUIMesh needs to handle). It's still experimental but feel free to try it and get back to me if you find bugs or need any changes.
https://github.com/MPintoSpace/GUIMesh3  

Best,
Marco