[heycam/webidl] Consider flipping the [Unscopable] design (#361)

Rather than adding [Unscopable] to each new member on Element and Document (elsewhere?) maybe we should instead annotate all existing members with [Scopable] and not add that for new members? Or enumerate all existing members somewhere to avoid cargo culting?

It's very easy to forget adding [Unscopable] and we continue to run into subtle issues because of that.

See https://github.com/whatwg/fullscreen/pull/84 for the latest installment.

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https://github.com/heycam/webidl/issues/361