Re: [heycam/webidl] [wip] First pass at adding internal slots (#495)

I wanted attributes to be somewhat automatically backed by slots for these cases:

* Defining new events. Currently we cheat for events and don't say that https://dom.spec.whatwg.org/#interface-customevent for instance also has a [[Details]] internal slot. I was hoping that making this defined could be done without any effort on specification editors.
* Defining getters without prose. `CustomEvent` has a `details` getter, but all it does is returning [[Details]]. This could follow from IDL rather than requiring boilerplate. (This might also apply to setters that only do type coercion but I have a hard time coming up with an example.)
* More speculative: when allocating a new platform object, attributes on that platform object backed by their own platform object could automatically have their slot filled with a platform object of that type created in a consistently-chosen Realm. (E.g., consider `document.implementation`.)

I don't really want to block on this though, having shared understanding and a consistent editorial policy around private state is much more important to me.

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