Mediagrains

What's Changed
* Regenerate static files by GeorginaShippey in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/151
* Regenerate static files by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/152
* Regenerate static files by philipnbbc in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/153
* Fix CI by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/154
* Add Grain.presentation_origin_timestamp/range by philipnbbc in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/155


**Full Changelog**: https://github.com/bbc/rd-apmm-python-lib-mediagrains/compare/5.0.0...5.1.0

What's Changed
* Link to rendered documentation by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/142
* Regenerate static files by samdbmg in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/143
* Docs: Replace mention of jenkins with github actions by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/144
* Regenerate static files by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/145
* Regenerate static files by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/147
* Regenerate static files by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/148
* Add commit check workflow by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/149
* Make is_key_frame and temporal_offset optional by philipnbbc in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/150


**Full Changelog**: https://github.com/bbc/rd-apmm-python-lib-mediagrains/compare/4.0.4...5.0.0

**Full Changelog**: https://github.com/bbc/rd-apmm-python-lib-mediagrains/compare/4.0.3...4.0.4

What's Changed
* Fix tests by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/139
* Move to Github Actions by j616 in https://github.com/bbc/rd-apmm-python-lib-mediagrains/pull/140


**Full Changelog**: https://github.com/bbc/rd-apmm-python-lib-mediagrains/compare/4.0.2...4.0.3

- Switched to using asynctest for testing asynchronous code
- Made asynchronous IO wrappers that wrap synchronous IO do so using an executor thread pool
- Added support for automatically wrapping synchronous files in asynchronous wrappers to use them in gsf encoder

- Dropped all support for Python2.7
- Moved python3.6 specific submodules in tree
- Added `GrainWrapper` class to wrap raw essence in Grains.
- Added `wrap_video_in_gsf` and `wrap_audio_in_gsf` tools to generate GSF files from raw essence.
- Added `extract_from_gsf` and `gsf_probe` tools to extract essence and metadata from GSF files.
- Added MyPy as a dependency
- Deprecated old asyncio code from v2.6
- Added Asynchronous GSFEncoding using the standard Encoder in a context-manager type workflow.
- Added Asynchronous GSFDecoding using the standard Decoder in a context-manager type workflow.