Using https://github.com/asottile/pyupgrade
1. `__future__` imports and `coding: utf-8` were removed
2. Files were rewritten with `pyupgrade --py36-plus --keep-percent-format`
3. f-strings were cherry-picked from `pyupgrade --py36-plus`
Extractors are left untouched (except removing header) to avoid unnecessary merge conflicts
Closes#282
* Refactor authorization as an extension to `_download_json`
* Better error messages and warnings
* Respect `--ignore-no-formats-error`
* Extract subtitles from manifests
* Try with crackle's geo-location service if all hard-coded countries fail
* All modules and binary names are changed
* All documentation references changed
* yt-dlp no longer loads youtube-dlc config files
* All URLs changed to point to organization account
Co-authored-by: Pccode66
Co-authored-by: pukkandan
Simon Sawicki