Add ARIA role values and ARIA 1.1 attributes

[dstorey]

Updates #320 to:

• Include ARIA 1.1 attributes:
  • aria-colcount
  • aria-colindex
  • aria-colspan'
  • aria-current
  • aria-describedat
  • aria-errormessage
  • aria-kbdshortcuts
  • aria-modal
  • aria-placeholder
  • aria-roledescription
  • aria-rowcount
  • aria-rowindex
  • aria-rowspan
• Add the valid values for the role attribute from ARIA 1.1
  • Widget Roles
  • Document Structure Roles
  • Landmark Roles

For the roles, I started a new line for each category of role so that it easier to see where each starts when maintaining the list. I also hard wrapped in categories with many items to keep same max line lengths as the file.

[msftclas]

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[aeschli]

@dstorey You are awesome! Thanks a lot.