[whatwg/fetch] Breaking: redo value parsing as value extraction (#494)

We now have two separate algorithms that can be used rather than one
with type confusion:

* “extracting header values” (takes a header)
* “extracting header list values” (takes a name and a header list)

Fixes #474.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/494

-- Commit Summary --

  * Breaking: redo value parsing as value extraction

-- File Changes --

    M fetch.bs (144)

-- Patch Links --

https://github.com/whatwg/fetch/pull/494.patch
https://github.com/whatwg/fetch/pull/494.diff

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