Re: [w3c/editing] contenteditable-disabled (#176)

I have tried with a first version that should provide what we discussed. It's basically using the DOMTokenList used in `element.classList` and  and `iframe.sandbox`. But as we are disabling and we wanted to have a way to access a full overview of all supported token values, we would need to extend it in some way to allow for that (`supports(token)` only checks whether a given token is supported).

I don't feel support confident about webidl, so I am especially interested in reviews to the interface definitions.

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