[w3c/browser-payment-api] Add canMakePayment() method (#380)

This closes #310, and closes #316 (which it is roughly based on), and closes #367 by intentionally allowing user agent leeway in restricting repeated calls to canMakePayment().

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The main difference from #316 is in allowing user agents maximum flexibility in protecting against fingerprinting, instead of trying to prescribe an algorithm for doing so. It also contains a number of fixes to the algorithm.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/380

-- Commit Summary --

  * Add canMakePayment() method

-- File Changes --

    M index.html (72)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/380.patch
https://github.com/w3c/browser-payment-api/pull/380.diff

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