[FR] add a stop/continue for folders like for list

[mpaolo]

When a file in a folder is played, if the folder contains other files they're played in turn when the active one ends. I thought the 'when a list ends ...' stop/continue option works here too but seems it doesnt. BTW I tried by enqueuing just 1 file (should be 1 item list) but it didnt stop at end despite the option set to 'stop'.
In short, I'd rather have an option to make the player stop at end of a song, rather than go through the folder/album content. ATM I made 1 folder per file as temp solution.

thx