Re: [w3c/gamepad] Need to spec liveness of Gamepad objects (#8)

From what I can tell this can be made sensible in terms of not changing state while script is running and `FrozenArray<T>` can be used.

I think any remaining warts after this might be with `navigator.getGamepads()` itself. It currently returns an array of fixed length where all entries can be null, presumably because originally the index was to be kept stable when the `Gamepad` instance might be replaced. If a `Gamepad` object is connected to the underlying gamepad and updated at well defined times, it seems to me that `navigator.getGamepads()` could just return an empty array if there are no gamepads. But there's some chance that's not web compatible.

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