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

Reportedly when writing components it would be convenient to be able to remove a whole swatch of event listeners through a common identifier, rather than having to enumerate all the specific types and callbacks.

I have discussed this a long time ago with @wycats I believe and more recently with @RByers. Now that `addEventListener()` supports a dictionary we could make this a reality. E.g.,
```js
obj.addEventListener("click", ..., { class: "clicker" })
obj.addEventListener("focus", ..., { class: "clicker" })
obj.removeEventListener({class: "clicker" })
```
An alternative to overloading `obj.removeEventListener()` would be adding something like `obj.removeEventListenerClass("clicker")`, but that seems less extensible.

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