URL mapping

[sashafirsov]

some rudimentary mapping is already implemented, question is what standard to follow ?
There are some related uses and proposals:

• https://github.com/WICG/import-maps
• https://github.com/WICG/import-maps#community-polyfills-and-tooling
• https://wicg.github.io/import-maps/

https://github.com/open-wc/open-wc/tree/master/packages/import-maps-resolve
https://github.com/WICG/import-maps/blob/master/reference-implementation/lib/resolver.js

• aliases in requireJs http://blog.firsov.net/2017/