[whatwg/dom] Make the two ways of event creation share a path (#603)

This introduces the "inner event creation steps" so we don't duplicate a bunch of logic.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/603

-- Commit Summary --

  * Make the two ways of event creation share a path

-- File Changes --

    M dom.bs (78)

-- Patch Links --

https://github.com/whatwg/dom/pull/603.patch
https://github.com/whatwg/dom/pull/603.diff

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