New rules + other changes

Add new rules:

jsx-a11y/accessible-emoji
jsx-a11y/aria-activedescendant-has-tabindex
jsx-a11y/iframe-has-title
jsx-a11y/no-autofocus
jsx-a11y/no-distracting-elements (breaking: consolidated no-marquee and no-blink into this rule.)
jsx-a11y/no-redundant-roles

[fix] - redundant-alt to only check full words
[docs] - Documentation upgrades across the board.
[new] - Add ignoreNonDom option to aria-role
[dev] - Add script to scaffold new rule creation.