Move away make + bash scripts to be Windows friendly

[carolynvs]

I am looking for ways to make building Porter on Windows be a better experience. Right now the best way to do this is install WSL and build linux on a linux distribution like ubuntu. But it's a lot of work getting a new contributor set up with a working environment.

I was looking at Mage as a replacement for make + bash scripts. The build scripts would then be written in Go and could be executed by someone on any OS. I think this would really cut down on setup instructions. People could build Porter on native Windows.

What do you think?