[heycam/webidl] Dictionary mixins (#195)

ExtendableMessageEvent defined at https://w3c.github.io/ServiceWorker/#extendablemessage-event-section and MessageEvent defined at https://html.spec.whatwg.org/multipage/comms.html#messageevent are extremely similar.

To duplicate less and consolidate fixes in a single place it would be better if they used a shared mixin. However, that would not work for initializing them as the dictionaries would still need to have the duplication.

Thus, the need is born for dictionary mixins.

Background: https://github.com/w3c/ServiceWorker/issues/989.

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