Re: [whatwg/url] Add non-special-URL hosts (#185)

This should be once again ready for review. Proposed commit message:
```
Change non-special URLs

This makes two major changes to non-special URLs:

* Parse host differently. Rather than IDNA processing, percent-encode.
* Allow path to be empty. Rather than enforce a path as we do for "https" and other special schemes, allow for the possibility of it being empty for non-special URLs, which more closely aligns with the obsoleted IETF RFC.

Tests: https://github.com/w3c/web-platform-tests/pull/4406.

Fixes #148.
```

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