[w3c/manifest] Abstracting selecting an icon. (#710)

I'm using a similar "pick the best icon from this set" pattern in background fetch, and I'm wanting to use definitions from this spec.

This PR abstracts the prose for selecting an `ImageResource` from a list.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/710

-- Commit Summary --

  * Abstracting selecting an icon.

-- File Changes --

    M index.html (129)

-- Patch Links --

https://github.com/w3c/manifest/pull/710.patch
https://github.com/w3c/manifest/pull/710.diff

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https://github.com/w3c/manifest/pull/710