Re: [heycam/webidl] add a type to represent the undefined value (#60)

Sorry to bring this issue up, but I already miss the `void` type. As mentioned above `undefined foo()` sounds a little bit weird to me. I'd probably use `undefined` only if it has a *particular meaning*. For example, in a find function, I'd return undefined if I cannot find the value. 

On the other hand, `void` is useful to state that a function does not return anything. This is also how Typescript describes the `void` type: https://www.typescriptlang.org/docs/handbook/basic-types.html. I'd take inspiration from there and reintroduce the void type.  

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