Extend the Image/Video players to support additional services.

[rjhowell44]

With the current implementation, Players can be called to queue file-paths and then play, pause, stop, and play next . Each file-path is pulled off the queue, in turn, and played automatically or when the client calls play next.

Want to update the behavior to not remove the file-paths from the queue, so that the Player can play previous.... meaning the queue will become a list instead. Additional services will be added to

• clear the current list of file paths
• add an entire folder of files to the Player's list of files to play