[whatwg/fullscreen] Define fullscreen in terms of feature policy (#106)

https://wicg.github.io/feature-policy informally declares Fullscreen to be a policy-controlled feature (and Chrome currently implements it as such). I'm trying to work out what it would take to make that more formal.

Currently, I have:

 * Define fullscreen as a policy-controlled feature in this spec, referencing the FP spec.
 * Update 'allowed to use' in HTML to query a document's FP (already monkey-patched in FP).
 * Update privacy and security in this spec to mention alternative ways that fullscreen could be enabled.

I'm sure I'm missing something big still :)

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https://github.com/whatwg/fullscreen/issues/106