[w3c/payment-request] Remove modifiers (#957)

This includes #955 ... will rebase this once it's merged. Don't review this yet. 


closes #???

The following tasks have been completed:

 * [ ] Confirmed there are no ReSpec errors/warnings.
 * [ ] Modified Web platform tests (link)
 * [ ] Modified MDN Docs (link)
 * [ ] Has undergone security/privacy review (link)
 
Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [ ] Firefox (link to issue)
 * [ ] Edge (public signal)

Optional, impact on Payment Handler spec?

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/957

-- Commit Summary --

  * remove features and examples related to addresses and contact information
  * fix one thing for less data (paymentoptions deleted)
  * @danyao observed that the comment in the example referred to shipping but the
  * restored tax and now total works. :)
  * Additional test removals
  * tidy
  * Fixup more tests
  * Remove modifiers

-- File Changes --

    M index.html (2355)

-- Patch Links --

https://github.com/w3c/payment-request/pull/957.patch
https://github.com/w3c/payment-request/pull/957.diff

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