Re: [whatwg/fullscreen] Reinstate the hierarchy restrictions (#91)

OK, I've pushed something that should work. I worry a bit about making the ready check recursive again, because it's a cross-process access and can't actually be checked synchronously. In other words, hierarchy restrictions is a simplifications in some ways, but not in others. However, I lean towards having them for the time being.

@upsuper, are you OK with the `dialog` bit, or should I add a TODO there and file a separate issue, blocked on usage data? Yet another possibility would be to change https://fullscreen.spec.whatwg.org/#top-layer-add to do nothing if the element already exists, so that things can never move in the top layer. Then `showModal()` would need to handle that situation instead.

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