Interest to support Windows via powershell?

[timfel]

This is more of a question: I have some advice (https://gist.github.com/timfel/897a48f6cd27361b72b3f59c56eed909) that I use to make exec-path-from-shell work when I am on Windows. It has some extra options to handle the situation on that operating system that the Powershell profile is updated by various commandline tool installers, and the Microsoft compiler toolchain is not by default on the PATH.

The way I use it is simply customizing exec-path-from-shell-shell-name to be powershell.exe on Windows, and then exec-path-from-shell-initialize and the other calls work, because the advice redirects to powershell in that case.

So, if this is interesting to include, I'm happy for you to take it (or I can open a PR), but if not, also fine :)