add ability to build for windows

[saylestyler]

Running yarn run package-win errors out

Steps to Reproduce (for bugs)

1. checkout dev, run yarn, followed by yarn run package-win

gist with debug output

Context

let's build for all platforms!

Your Environment

• Node version : 12.4.0
• Yarn version: 1.17.0
• Version or Branch used : dev
• Operating System and version : OS X Mojave 10.14.5