Take &Arc instead of Arc in poll_future and poll_stream
#433
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Part of issue #341 (fixes it?). As can be seen in the wait methods this prevents one
Arcclone for every polling after the first one. Did not benchmark but seems like a nice performance optimization. However this makes the syntax around polling complicated because one does not simply cast&Arc<T>to&Arc<Trait>.Thanks @stephaneyfx for helping me with the trait object magic in IRC.