Re: [whatwg/url] Preserve "localhost" in file URLs? (#618)

I realize that Chromium's solution is going to be a bit tricky to implement in the Standard, given the way the parser is set up currently. We would have to make two additions:

* in the [path state](https://url.spec.whatwg.org/#path-state): to check whether the host is `localhost` and strip it if needed
* counterintuitively, also in the [host state](https://url.spec.whatwg.org/#host-state): to check whether the _path_ starts with the drive letter

The path state addition takes care of the parsing-from-scratch case as well as `u.pathname = 'C:/abc'`. The host state addition is needed for `u.host = 'localhost'` on a URL that already has a Windows drive letter.

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Related to this, I've really starting to prefer separate parsing and canonicalizing stages, rather than putting everything in a single parser algorithm. That architecture not only simplifies implementing this change, but also makes proving roundtrippability easier (it's easier to show that canonicalization is idempotent).

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