[heycam/webidl] Make null an explicit type (remove nullable types) (#866)

In #827 the idea came up that now that we have unions we could handle null in a generalized way. That is, rather than `DOMString?`, you would write `(DOMString or null)`.

I like that this adds a lot of clarity with regards to the allowed values, but I do worry a bit about the verbosity. We might want to add a typedef for `NullableDOMString` or some such.

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