[Feature request] Add folder to queue & play folder recursively

[icehaunter]

I would like to be able to add to queue a full folder. Right now the "play all" button adds to queue, but to the front, which is not always what I want.

On another note, I'd like to be able to play folder with all subfolders instead of going into each subfolder and pressing "play all".

[jaedb]

Further investigation is required to ascertain whether this is beneficial to the wider userbase. I am opening this for votes to determine whether it is a wise spend of limited developer resources.