[w3c/clipboard-apis] Initialization of clipboardData by ClipboardEvent constructor (#64)

Per https://bugs.chromium.org/p/chromium/issues/detail?id=800742

In Chrome 63, this results in null: `new ClipboardEvent('paste').clipboardData` - there's no code to populate the event's clipboardData with anything if it's not provided e.g. by passing `{clipboardData: new DataTransfer}` as the options. Firefox provides a default DataTransfer instance.

Two problems: 

* [ ] The spec doesn't describe how the constructor works.
* [ ] The spec prose has _"The clipboardData attribute is an instance of the DataTransfer interface"_ but the IDL has `readonly attribute DataTransfer? clipboardData;` - these seem to disagree on nullability.

I'd expect the constructor prose to say something like "If _eventInitDict_ is not given, or _eventInitDict_'s _clipboardData_ dictionary member is null, then initialize _event_'s **clipboardData** to a newly created `DataTransfer` object." to fix the first point.

But then the second point is weird - how do you get a null in there?

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