Re: [whatwg/dom] Removing event listeners through an identifier (#208)

I've updated #469 to allow only strings and symbols, and to allow a sequence of groups (although I kept the name `group`; instead of `groups`; opinions welcome?). I am OK with the added complexity of the sequence if we think it's OK to not include it in the key. (So, you can add the same listener twice if you use different groups each time.)

Next up is updating the tests. Still hoping for some implementer interest beyond Chrome; thoughts @rniwa or @smaug----? :)

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