PySpecTools installation on Windows

[laserkelvin]

This was raised by Houston Smith from UW-Madison, trying to install PySpecTools through the Anaconda Navigator on Windows, returning this error:

ResolvePackageNotFound: 
- ncurses=6.2
- libstdcxx-ng=9.1.0
- libgcc-ng=9.1.0
- libedit=3.1.20191231
- libgfortran-ng=7.3.0
- readline=8.0
- ptyprocess=0.6.0
- libffi=3.3
- ld_impl_linux-64=2.33.1

I believe these are Linux only packages, and for whatever reason --no-build when creating conda.yml left them in. Will remove these in conda.yml and see if it solves this issue.

[laserkelvin]

Seems like removing Cython routines largely helped with getting the installation to work on Windows. Ideally I'd like to have CI setup to build in Windows environments, but apparently this is not yet so straightforward.