* [docs] Fix typo
* Do not enable `sponskrub` by default
* Fix `--force-keyframes-at-cuts`
* Don't embed subtitles if the video has been cut. Previously, running `--remove-chapters` with `--embed-subs` multiple times caused repeated cuts and out-of-sync subtitles
* Store `_real_duration` to prevent running ffprobe multiple times
SponsorBlock options:
* The fetched sponsor sections are written to infojson
* `--sponsorblock-remove` removes specified chapters from file
* `--sponsorblock-mark` marks the specified sponsor sections as chapters
* `--sponsorblock-chapter-title` to specify sponsor chapter template
* `--sponsorblock-api` to use a different API
Related improvements:
* Split `--embed-chapters` from `--embed-metadata`
* Add `--remove-chapters` to remove arbitrary chapters
* Add `--force-keyframes-at-cuts` for more accurate cuts when removing and splitting chapters
Deprecates all `--sponskrub` options
Authored by: nihil-admirari, pukkandan
