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This commit implements the first half of [RFC #5] where the `Deref` trait is implemented for all imported types. The target of `Deref` is either the first entry of the list of `extends` attribute or `JsValue`. All examples using `.as_ref()` with various `web-sys` types have been updated to the more ergonomic deref casts now. Additionally the `web-sys` generation of the `extends` array has been fixed slightly to explicitly list implementatoins in the hierarchy order to ensure the correct target for `Deref` is chosen. [RFC #5]: https://github.com/rustwasm/rfcs/blob/master/text/005-structural-and-deref.md