[w3c/browser-payment-api] Disallow multiple showing payment requests per user agent (#487)

This contains a few separate ground-laying commits while I was in the area, plus a third commit actually implementing the discussion from #462. Ideally they should be merged separately (with "rebase and merge").
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/487

-- Commit Summary --

  * Small fixes to show(), mostly editorial
  * Properly queue tasks for user accepts/aborts algorithms
  * Disallow multiple showing payment requests per user agent

-- File Changes --

    M index.html (83)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/487.patch
https://github.com/w3c/browser-payment-api/pull/487.diff

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https://github.com/w3c/browser-payment-api/pull/487