JS - support kotlin-browser web.dom.* packages

[reubenfirmin]

The kotlin team are starting to push devs to use the kotlin-wrappers. kotlin-browser moves all of the browser api to the web.dom package.

For js, support append/create etc on web.dom.HTMLElement.

[reubenfirmin]

I have a fork for this, which you can pick up from: https://github.com/reubenfirmin/kotlinx-html-new