[whatwg/url] Close more gaps between URL writing and parser sections (PR #924)

Three fixes align the writing grammar with the parser, addressing divergences reported in #704:

* Introduce path-absolute-non-authority-URL string. Where scheme-relative and path-absolute were both offered as top-level alternatives, inputs starting with `//` could fall back to path-absolute when the scheme-relative form failed. This made `foo://:80`, `foo://h@x`, `foo://h:8x`, and `//:80` (against `https://`, `foo://`, and `file://` bases) incorrectly valid.

* Remove path-absolute-non-Windows-file-URL string. The parser accepts `file://host/C:/demo` and `/C:/path` against `file://server/tmp/` without validation errors, so the grammar should too.

* Require U+0023 (#) in the opaque-path branch of relative-URL-with-fragment string. The empty string against `foo:opaque` was valid by the grammar but fails to parse.

Helps with #704.


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  https://github.com/whatwg/url/pull/924

-- Commit Summary --

  * Close more gaps between URL writing and parser sections

-- File Changes --

    M url.bs (35)

-- Patch Links --

https://github.com/whatwg/url/pull/924.patch
https://github.com/whatwg/url/pull/924.diff

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