Libtmux

- Move `.coveragerc` -> `pyproject.toml` (443)

_Maintenance only, no bug fixes or new features_

Packaging

- Remove `MANIFEST.in`

This is handled by poetry's `include` in pyproject.toml.

_Maintenance only, no bug fixes or new features_

Packaging

- Remove `.tmuxp-before-script.sh` from `.tmuxp.yaml`

Fixes

- Use stable `pytest` API imports where possible to fix issues in downstream
packaging on Arch (441, via 442)

Packaging

- Add `.tmuxp-before-script.sh` (used by `.tmuxp.yaml`) and `conftest.py` to
source distributoins (441, via 442)

Tests / docs

- Examples for pytest plugin (439)
- Move conftest.py to root level (440)

- https://docs.pytest.org/en/stable/deprecations.html#pytest-plugins-in-non-top-level-conftest-files
- Less conftest.py files
- We can now run py.test for `README.md` without needing to proxy through
`docs/index.md`

**Maintenance release, no features or fixes**

Tests

- pytest plugin: Initial tests (for testing the plugin itself, 423)

Packaging

- pyproject.toml: Note pytest framework in trove classifiers

Infrastructure

- CI speedups (428)

- Avoid fetching unused apt package
- Split out release to separate job so the PyPI Upload docker image isn't pulled on normal
runs