[whatwg/dom] Allow constructing and subclassing EventTarget (#467)

Closes #441. See also https://www.w3.org/Bugs/Public/show_bug.cgi?id=16487.

Tests on the way; will edit this when they're ready.

Chrome is interested in implementing this; anyone else? @cdumez @smaug---- @travisleithead
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/467

-- Commit Summary --

  * Allow constructing and subclassing EventTarget

-- File Changes --

    M dom.bs (20)

-- Patch Links --

https://github.com/whatwg/dom/pull/467.patch
https://github.com/whatwg/dom/pull/467.diff

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