Windows build

This page isn't complete yet. I can't remember exactly how I got the Windows build working, but I did.

I had to build boost-python ( with shared libraries turned on ) for the version of Python I am using ( 3.6.5 32 bit ). The projects ( cad, geom, step, cam ) all have .sln files which I open in Visual Studio 2013 Community Edition. They all use the Release configuration, the Debug configurations don't have the right parameters.