Ffmpeg-normalize

* Update docs and completions.

* Implement `--auto-lower-loudness-target`

* Fix deprecations and mypy --strict errors.

* Feat: add completions.

* Docs: update explainer.

* Docs: update docs to include lower-only.

* Change lower-only message to warning.

* Make setup name PEP 625 compliant.

* Docs: add ahmetsait as a contributor.

* Implement `--lower-only`

* Fix: `--print-stats` only outputs the last stream.

* More robust `loudnorm` output parsing.

* Remove unnecessary conversions.

* Update .editorconfig.

* Remove python 3.8, add python 3.12, 3.13.

* Add README on file size.

* Fix: show percentage with two decimal digits in progress.

* Chore: add python 12.

* Fix: override argparse usage.

* Add option to set audio channels directly.

* Make colorama dependency windows-only.

* Update.

* Update badges.

* Docs: add kanjieater as a contributor.