Allow chaining map / try_map #854
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These traits were a workaround for a bug in rustc that an earlier revision of the API triggered, but the API has since been changed.
To support `.map()` / `.try_map()` on `query!()` (and `query_as!()`).
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The same thing as #823, but a new PR because GitHub doesn't allow reopening after closing, then force-pushing to the head branch. @abonander's review feedback has been incorporated (hence the force-push).