Add prettier, with workflow on GitHub

[TimRudy]

Note in the first commit these code changes, hopefully make no difference!

• utils.js removes dependency: window,
• collections.js removes nodePath,
• drivers.js removes nodePath,
• compiler.js removes nodeSha1,

[TimRudy]

Hey Charli, I'll let you push a "npm i" to this so that the package-lock file is synched. If I did it on my machine, maybe there would be a diff compared to the normal routine - OK? Hope it works great :-)