[w3c/uievents] Define "event constructing steps" for complicated events (#194)

As @domenic mentioned in https://github.com/whatwg/dom/issues/414 some UI events, such as `MouseEvent` and `KeyboardEvent`, do not have a straight mapping from initializing dictionary member to internal state. For those event classes the DOM Standard has "event constructing steps", added in https://github.com/whatwg/dom/pull/614.

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