Short description of what this resolves:
Allows our e2e tests to run on a Windows machine
Changes proposed in this pull request:
Normalize paths using path.join()
Add typeRoots to the root tsconfig file
Change the spawnedCommand based on the OS
Fixes: #11551
* chore(e2e): WIP to add files needed for app-scripts
* chore(e2e): WIP one e2e test building but with errors
* chore(e2e): move e2e.prod to working with app-scripts
move shared functions into util, add support for debug flag when
running e2e.prod / demos.prod which gets passed to app-scripts
* chore(build): fix app-scripts build for all e2e and demos
* chore(e2e): update ionic-angular import path
* chore(build): update dev paths to work with prod
* chore(e2e): get watch working with e2e prod
* docs(scripts): update README for running e2e and demos
closes#8411closes#10023