[LLPlayer] Automatically pause video after each subtitle line

_First of all, congratulations on the great work you've done, this is brilliant!_ I am a Language Reactor user and by far the most useful feature they have is called: "Automatically pause playback at the end of every subtitle [Q key]" Image:  This is extremely useful because you can hear the person say something then it automatically stops. You can say it out loud, read the text a bit, even press S to replay a few times, inspect the words. After you took your time, you press Spacebar and the video plays the next line only to stop again at the end of the line.