Re: [heycam/webidl] void -> undefined, and allow it anywhere. (#906)

@domenic commented on this pull request.

Wow, this turned out simpler than I expected. I guess the actual change, e.g. allowing it in unions, falls out of changing the grammar?

Let's fold in Type into ReturnType. Then we should make sure we're ready for a big spec update of this magnitude before merging:

- File issues on all the places located in https://github.com/heycam/webidl#filing-issues-elsewhere, pointing to this about-to-be-merged PR.
- @saschanaz, can you get your bot ready to pull request all the specs?
- /cc @foolip and @stephenmcgruer who has been doing some IDL stuff, I think related to reffy reports. (Maybe reffy should also go in that list of places to file issues?)

> @@ -2520,7 +2525,6 @@ steps are:” followed by a list, or “The <code>|operation|(<var ignore>arg1</
 <pre class="grammar" id="prod-ReturnType">
     ReturnType :
         Type

Let's fold it away; I think a big win of this PR is unifying the two value spaces.

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