Updating for Python3 and Windows

[jgalak]

Not sure if you have any interest in this project anymore, but it seems quite useful. I've updated it to work with Python 3 and to work on Windows, but it needs more testing.

Changes included: running the 2to3 utility, manually changing some print statements into print() calls, changing DictType to dict in many places, adding OpenSCAD.exe as an alternate name for OpenSCAD, and fixing what appears to have been a bug where a csv file was being opened in binary mode rather than text.

If you do want to incorporate this, please test it thoroughly - I'm barely understanding how this system works, so I may have not run many of the parts of the scripts.