[whatwg/url] IDNA Nontransitional_Processing (#239)

@achristensen07 in https://github.com/whatwg/url/issues/110#issuecomment-261694624 you mention that WebKit uses Nontransitional_Processing (URL Standard currently requires Transitional_Processing).

However, it appears that this is not universally done:
```
const url = new URL("https://x/")
url.host = "faß.de"
url.host // fass.de (Transitional) rather than xn--fa-hia.de (Nontransitional)
```
That's a bug then I assume?

I have tests at https://github.com/w3c/web-platform-tests/pull/4504 but there's too many of them to easily digest (or run quickly). I haven't really figured out a strategy yet for how to tackle that problem.

In any event, with both WebKit/Safari and Firefox wanting Nontransitional_Processing, I think we should go for it and change that in the standard. And at least test faß.de for now in a less convoluted way.

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