ARIA IDL updates (adding keywords/states and missing/invalid values defaults)

[rahimabdi]

Closes #2281

• add enumerated attribute definitions, including missing/invalid value defaults, for the following attributes:
  • aria-atomic
  • aria-autocomplete
  • aria-busy
  • aria-checked
  • aria-current
  • aria-disabled
  • aria-expanded
  • aria-haspopup
  • aria-hidden
  • aria-invalid
  • aria-live
  • aria-modal
  • aria-multiline
  • aria-multiselectable
  • aria-orientation
  • aria-pressed
  • aria-readonly
  • aria-required
  • aria-selected
  • aria-sort
  • aria-valuemin
  • aria-valuemax
  • aria-valuenow
• Revise "A. Mapping WAI-ARIA Value types to languages" to include enumerated attributes
• Revise "6.2.4 Value" for permissible values (remove all other types except "enumerated"?)

Test, Documentation and Implementation tracking

Once this PR has been reviewed and has consensus from the working group, tests should be written and issues should be opened on browsers. Add N/A and check when not applicable.

• "author MUST" tests:
• "user agent MUST" tests:
• Browser implementations (link to issue or commit):
  • WebKit:
  • Gecko:
  • Blink:
• Does this need AT implementations?
• Related APG Issue/PR:
• MDN Issue/PR:

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