0.7.0

What's Changed

• 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!

Full Changelog: 0.6.0...0.7.0