[whatwg/fetch] Go deeper into HTTP caching (#373)

My first inclination is to break out some parts of HTTP-network-or-cache Fetch into new sections and then grow them.

Specifically - 

* bullets 17 and 18 ("If httpRequest's cache mode is neither...", "Otherwise, if httpRequest's cache mode is either...") should be shifted to a new "HTTP Cache Lookup" section, that specifies <http://httpwg.org/specs/rfc7234.html#constructing.responses.from.caches> algorithmically. 

* after bullet 19 ("If response is null, run these substeps..."), insert a new item (or reference to a new section, "HTTP Cache Storage" or similar, along the lines specified in <http://httpwg.org/specs/rfc7234.html#response.cacheability>. 

If that makes sense, I'll start a branch, and probably some tests too.

Question - Is the Streams work largely done? I suspect some of the fine points here are going to need them.


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