Re: [webidl] Add NotAllowedError exception (#85)

These errors tend to get reused broadly, don't they? E.g. `getUserMedia` [1] uses `SecurityError` for permission failure (rejection through user-chosen permission settings), which strikes me as similar to this use-case, unless I'm misunderstanding something?

[1] See http://w3c.github.io/mediacapture-main/getusermedia.html#dom-mediadevices-getusermedia

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