[a11y TF] TPAC 2018 preparations

A list of potential subjects for the ARIA+MathOnWeb meeting.

• separate text and Braille streams (in aria-live, in aria-label/alt, buttons) for specialized Braille formats
  • https://github.com/w3c/aria/issues/765
• Braille input
  • https://github.com/w3c/aria/issues/771
• custom tree structures via aria-own and their exploration
  • standard and custom tree walking (table, breadth first trees, depth-first trees)
• around aria labels / overrides
  • consistent punctuation pronounciation ('plus-dash-or-dash-minus' in JAWS vs NVDA)
  • user customizations (parenthesis vs paren, open vs left etc)
  • English "a" (schwa /ə/ versus /eɪ/)