Rust-itertools

- Add `EitherOrBoth::or` and `EitherOrBoth::or_else` (593)
- Add `min_set`, `max_set` et al. (613, 323)
- Use `either/use_std` (628)
- Documentation fixes (612, 625, 632, 633, 634, 638)
- Code maintenance (623, 624, 627, 630)

- Maintenance

- Add `Itertools::multiunzip` (362, 565)
- Add `intersperse` and `intersperse_with` free functions (555)
- Add `Itertools::sorted_by_cached_key` (424, 575)
- Specialize `ProcessResults::fold` (563)
- Fix subtraction overflow in `DuplicatesBy::size_hint` (552)
- Fix specialization tests (574)
- More `Debug` impls (573)
- Deprecate `fold1` (use `reduce` instead) (580)
- Documentation fixes (`HomogenousTuple`, `into_group_map`, `into_group_map_by`, `MultiPeek::peek`) (543 et al.)

- Add `Itertools::contains` (514)
- Add `Itertools::counts_by` (515)
- Add `Itertools::partition_result` (511)
- Add `Itertools::all_unique` (241)
- Add `Itertools::duplicates` and `Itertools::duplicates_by` (502)
- Add `chain!` (525)
- Add `Itertools::at_most_one` (523)
- Add `Itertools::flatten_ok` (527)
- Add `EitherOrBoth::or_default` (583)
- Add `Itertools::find_or_last` and `Itertools::find_or_first` (535)
- Implement `FusedIterator` for `FilterOk`, `FilterMapOk`, `InterleaveShortest`, `KMergeBy`, `MergeBy`, `PadUsing`, `Positions`, `Product` , `RcIter`, `TupleWindows`, `Unique`, `UniqueBy`, `Update`, `WhileSome`, `Combinations`, `CombinationsWithReplacement`, `Powerset`, `RepeatN`, and `WithPosition` (550)
- Implement `FusedIterator` for `Interleave`, `IntersperseWith`, and `ZipLongest` (548)

- **Increase minimum supported Rust version to 1.32.0**
- Improve macro hygiene (507)
- Add `Itertools::powerset` (335)
- Add `Itertools::sorted_unstable`, `Itertools::sorted_unstable_by`, and `Itertools::sorted_unstable_by_key` (494)
- Implement `Error` for `ExactlyOneError` (484)
- Undeprecate `Itertools::fold_while` (476)
- Tuple-related adapters work for tuples of arity up to 12 (475)
- `use_alloc` feature for users who have `alloc`, but not `std` (474)
- Add `Itertools::k_smallest` (473)
- Add `Itertools::into_grouping_map` and `GroupingMap` (465)
- Add `Itertools::into_grouping_map_by` and `GroupingMapBy` (465)
- Add `Itertools::counts` (468)
- Add implementation of `DoubleEndedIterator` for `Unique` (442)
- Add implementation of `DoubleEndedIterator` for `UniqueBy` (442)
- Add implementation of `DoubleEndedIterator` for `Zip` (346)
- Add `Itertools::multipeek` (435)
- Add `Itertools::dedup_with_count` and `DedupWithCount` (423)
- Add `Itertools::dedup_by_with_count` and `DedupByWithCount` (423)
- Add `Itertools::intersperse_with` and `IntersperseWith` (381)
- Add `Itertools::filter_ok` and `FilterOk` (377)
- Add `Itertools::filter_map_ok` and `FilterMapOk` (377)
- Deprecate `Itertools::fold_results`, use `Itertools::fold_ok` instead (377)
- Deprecate `Itertools::map_results`, use `Itertools::map_ok` instead (377)
- Deprecate `FoldResults`, use `FoldOk` instead (377)
- Deprecate `MapResults`, use `MapOk` instead (377)
- Add `Itertools::circular_tuple_windows` and `CircularTupleWindows` (350)
- Add `peek_nth` and `PeekNth` (303)

- Fix potential overflow in `MergeJoinBy::size_hint` (385)
- Add `derive(Clone)` where possible (382)
- Add `try_collect` method (394)
- Add `HomogeneousTuple` trait (389)
- Fix `combinations(0)` and `combinations_with_replacement(0)` (383)
- Don't require `ParitalEq` to the `Item` of `DedupBy` (397)
- Implement missing specializations on the `PutBack` adaptor and on the `MergeJoinBy` iterator (372)
- Add `position_*` methods (412)
- Derive `Hash` for `EitherOrBoth` (417)
- Increase minimum supported Rust version to 1.32.0