Multi-platform support

[Berkmann18]

Proposal

ES module support.

Motivation

For the moment, this library only works in NodeJS or wherever require-style imports work but not in the browser and it would be neat to make nclr usable in the browser too.

Possible help

https://2ality.com/2017/04/setting-up-multi-platform-packages.html
https://medium.com/@tarkus/how-to-build-and-publish-es6-modules-today-with-babel-and-rollup-4426d9c7ca71