Re: [heycam/webidl] Allow multimaps (or directly support them) (#514)

Discussing with @domenic in IRC illuminates some more differences between the two forms - `list<(key, val)>` semantics will usually want to `set()` in-place, like URLSearchParams does, deleting all the entries beyond the first, and with that, making `set()` n-ary doesn't make very much sense. (Tho `append()` should still be n-ary.)

On the other hand, for the `map<key, list<val>>` semantics, regardless of whether you set in-place or do a remove/append, it makes sense to `set()` multiple values at once.

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