[whatwg/dom] Redesign fire an event and target override (#344)

Fixes #187. Follow up work in HTML is tracked in
https://github.com/whatwg/html/issues/1713.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/344

-- Commit Summary --

  * Redesign fire an event and target override

-- File Changes --

    M dom.bs (39)
    M dom.html (32)

-- Patch Links --

https://github.com/whatwg/dom/pull/344.patch
https://github.com/whatwg/dom/pull/344.diff

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