shared queue

[ptdel]

there are more situations now where communication between the two services is needed. I'd like to avoid the need to have the api poll the player to see if it's got a track, or the player polling the api to see if it's got a track. The new flow will be to have both the api and player subscribe to a redis or something. there will be a subscription to act as the song queue, but other subscriptions that can be used to "communicate" between the two services without directly interfacing.