[heycam/webidl] Should callback interfaces with more than one operation be supported? (#661)

Looking at Gecko, there's `EventListener`, `NodeFilter` and `XPathNSResolver`, all with one operation; `ObserverCallback`, also with one operation, but shouldn't even exist (<https://bugzilla.mozilla.org/show_bug.cgi?id=1530702>); and `MozIdleObserver`, which isn't exposed to script. WebKit doesn't seem to have any others either.

There's already a note that suggests using dictionaries instead of callback interfaces, so I think we should bite the bullet and mark the entire thing as legacy, and reduce the spec to only support what's actually used.

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