Re: [fetch] Mechanism to indicate "destination context" (#64)

I no longer think MIME types are the correct abstraction. They are a) not the primitive implementations use (implementations use contexts) and b) somewhat useless for priority. (And because they are only useful for `Accept` I suspect MIME types will not help us much going forward either.)

Being able to influence or even set the `Accept` header makes sense, but soon you can do that for every fetch using `fetchsettings=""` or whatever we end up calling it.

Setting priority based on a MIME type is just not enough information. Navigating to an image is very different from embedding an image, or from loading an image as an icon. You really need context to determine the priority.

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