better multi-ep support with syncplay

[Stachelbeere1248]

Is your feature request related to a problem? Please describe.
Syncplay integrates ani-cli's auto-next / next episode buttons poorly.
To play the next episode without breaking, one has to manually close the player and syncplay, and only after that start the next episode, rejoining the room / server etc.

Describe the solution you'd like
Next button / going next episode adds next link to syncplay playlist, then plays next playlist entry, without leaving the room. Same thing should be applied to similar features like replay etc.

Describe alternatives you've considered
Write entire playlist to a temp file, tell syncplay to read it (--load-playlist-from-file) and completely remove next episode logic (with the -s flag) and use the syncplay one. Potential issue here could be that the change quality feature would no longer exist.

[Derisis13]

Good idea, especially since other players also have playlist navigation, but implementing communications between the player(s) and the script. If you have any idea on how to, I'm open to suggestions