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Add peeking_map_while #596

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devins2518
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This is a continuation of my rejected PR to the stdlib for itertools. The peeking_map_while functions and associated functions are similar to peeking_take_while except this maps a Option<&I::Item> to Option<B>. This of course brings the benefit that the iterator is not advanced when the predicate returns None.

@Niedzwiedzw
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I want this badly...

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