Octue

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**IMPORTANT:** There are 2 breaking changes.

Enhancements
- [x] **BREAKING CHANGE:** Add option to not show cloud directories as blobs in `GoogleCloudStorageClient.scandir`

Fixes
- [x] Ensure nested datasets' structures are preserved on download

Refactoring
- [x] Clarify `Dataset.download_all_files`
- [x] **BREAKING CHANGE:** Rename `Dataset.from_cloud` parameter

Testing
- [x] Make unittest ignore `ResourceWarnings` for clearer test output
- [x] Temporarily skip test failing on Windows

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Contents

Enhancements
- [x] Support nested datasets in `Dataset.from_cloud`
- [x] Give a more useful string representation to `Datafile`

Testing
- [x] Stop emulated cloud storage tests interfering with each other
- [x] Loosen remote logging test case for tox

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Operations
- [x] Fix `mkver.conf` so the semantic version suggested by `git-mkver` stays under `1.0.0`

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Thanks to idc101 [for this solution](https://github.com/idc101/git-mkver/issues/20)!

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Testing
- [x] Fix subprocess logging tests

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Summary
Ensure bullet points render in docs. The problem may have been one of the things listed in [here](https://stackoverflow.com/questions/67542699/readthedocs-sphinx-not-rendering-bullet-list-from-rst-file). Note that some Chromium-based browsers still aren't rendering the bullet points, but Safari now is.

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Fixes
- [x] Explicitly add `sphinx-tabs` and `sphinx-rtd-theme` to `sphinx` extensions in `conf.py`

Dependencies
- [x] Use latest `sphinx-rtd-theme` for docs

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Summary
Clarify the interface for serialising `Serialisable` instances. Serialising now clearly means converting instances to a string, while a new `to_primitive` method converts instances to a dictionary of python primitives.

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Contents

Refactoring
- [x] Only allow `Serialisable.serialise` to serialise to strings
- [x] Factor new `Serialisable.to_primitive` method out from `Serialisable.serialise` and use it to replace previous usages of `Serialisable.serialise(to_string=False)`

Operations
- [x] Allow `test` branch prefix and remove the old `release` prefix

Testing
- [x] Test datafiles with spaces in name work as expected

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