Added autoplay option to automatically progress through playlist
I was looking for something easy to do for my first contribution and came across this feature that's been demanded.
I tried to avoid conflicts with other options, notably the "repeat" option. My suggestion would be to prevent a playlist from repeating if autoplay is disabled : forwarding manually to the next video will go back to the beginning of the playlist and that behavior is in accordance with the role of the autoplay option.
Let me know what you think.
Edited by Victor Blanchard