Re: [whatwg/url] Fix: allow percent encoded code points in the non-special URLs host (#218)

I further investigate this problem and I think a very basic IPv6 check can help here (change [URL-host parser](https://url.spec.whatwg.org/#concept-url-host-parser) 2 step to):

2. If <var>input</var> starts with "[" and ends with "]", then if <var>input</var> between "[" and "]" contais a [forbidden host code point](https://url.spec.whatwg.org/#forbidden-host-code-point) excluding ":", syntax violation, return failure.
3. Otherwise, if <var>input</var> contains a [forbidden host code point](https://url.spec.whatwg.org/#forbidden-host-code-point) excluding "%", syntax violation, return failure. 

This disallows such weird URLs: `non-special://[:80` or `non-special://]`

And term <dfn>"forbidden opaque host code point"</dfn> (304f0ae21880634842fff05bbcf9b03975a4344) will not be required anymore.

If you agree, I can prepare a new commit.

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