Xocto

- Improve the performance of `FiniteDatetimeRange.intersection`,
`FiniteDatetimeRange.union` and `FiniteDatetimeRange.__lt__` [187](https://github.com/octoenergy/xocto/pull/187).

- Add `ranges.any_gaps` function [185](https://github.com/octoenergy/xocto/pull/185).
- Improve the performance of the `ranges.any_overlapping` function
(with some benchmark showing a >100x speed up) [184](https://github.com/octoenergy/xocto/pull/184).

- Add `FiniteDatetimeRange.as_date_range` [181](https://github.com/octoenergy/xocto/pull/181)
- [Breaking] Remove `ranges.date_range_for_midnight_range` (replaced by FiniteDatetimeRange.as_date_range)[181] (https://github.com/octoenergy/xocto/pull/181)

- Add `ranges.date_range_for_midnight_range` [178] (https://github.com/octoenergy/xocto/pull/178)
- Add `FiniteDatetimeRange.localize` [178] (https://github.com/octoenergy/xocto/pull/178)

- Add optional `timezone` parameter to datetime-based range fields [174] (https://github.com/octoenergy/xocto/pull/174)

- [Breaking] Use parameter object for passing options to `pact_service`.
Rename parameter `pact_version` to `consumer_version`.
[166](https://github.com/octoenergy/xocto/pull/166)
- Fix bug with `list_files` method in `S3SubdirectoryFileStore` [171] (https://github.com/octoenergy/xocto/pull/171)