Ffmpeg-normalize

* Bump requirements.

* Add py.typed support.

* General refactoring + type hints (202)

* Re-write to f-strings when possible (201)

* Remove unnecessary utf-8 declarations (200)

"-*- coding: utf-8 -*-" is a Python 2 construct and can be safely
removed. Other utf-8 declarations are also unnecessary.

* Add .editorconfig.

* Link to API docs.

* Add docs.

* Add type hints, document everything, refactor some code.

* Add more audio formats (199)

* Add python 3.11 to CI.

* Docs: add WyattBlue as a contributor for code (198)

* docs: update README.md

* docs: update .all-contributorsrc

* Upgrade to Python 3.8 syntax (197)

* Fix python version in github tests.

* Bump requirements to latest versions.

* Add python 3.11 to list of languages.

* Bump required python version to 3.8.

* Various minor code cleanups and type hints.

* Harmonize logger code.

* Update python version in tests.

* Docs: add mvbattista as a contributor.

* Docs: add mpuels as a contributor.

* Docs: add Mathijsz as a contributor.

* Docs: add Nottt as a contributor.

* Docs: add justinpearson as a contributor.

* Docs: add kostalski as a contributor.

* Docs: add jetpks as a contributor.

* Docs: add aviolo as a contributor.

* Docs: add thenewguy as a contributor.

* Docs: add Geekfish as a contributor.

* Docs: add benjaoming as a contributor.

* Reference speechnorm.

* Update README.

* Update list of pcm-incompatible extensions.

* Constrain parsed ranges to avoid out of bounds, fixes 189.

* Fix readme for extra-input-options.

* Warn about dynamic mode only if not already set, fixes 187.

* Add warning in case user specifies both --lrt and --keep-loudness-range-target.

* Add option to keep loudness range target, fixes 181.

* Only show warning about disabling video if not yet disabled, addresses 184.