================
- Rename ``dtstart``/``dtuntil`` to ``start``/``stop``
- Rename ``interval`` to ``every``
- Rename ``AnimationScenario.steps`` to ``AnimationScenario.sequences``
- Improve scope of values for ``every`` parameter. It will now accept relative
humanized timestamps like ``2m30s``, ``1d12h`` or ``1.5 days``.
- Allow relative timestamps / time ranges also for ``start`` and ``stop``
parameters. Accepted are humanized values like outlined above (``2m30s``),
combined with, e.g., ``stop=start+2m30s`` or ``start=-1h, stop=now``.
- Add CI configuration for GHA
- Enable support for relative timestamps with months and years, like ``1y3mo``.
- Avoid ``ffmpeg``'s *height not divisible by 2* errors. Thanks, cure!