Ability to add chapter markers for video files

[halcyoncmdr]

The ability to add chapter markers to video media would help with longer videos. Something similar to Youtube's chapter system that highlights a section or even just a marker of where a chapter separation is with the name for that chapter on mouse over.

At the moment, my workaround is adding a note with timestamps, but this is a clunky solution and difficult to add since media cannot be interacted with to scrub through while the notes window is open for editing.

[Zweibach]

It's always a bit of a hit and miss whether mpv options work in Hydrus but with this option --chapters-file=<filename>, Hydrus would just need a way to provide a file. Preferably while also being able to edit it from within Hydrus, potentially through the notes system. Basically mirroring a note to a file and passing that file to mpv when opening a file with mpv.