implement/bring back lobby music

[babayetu83]

something nice and relaxing to contrast the murder, torture, human rights violations, violations of the Geneva convention that are soon to follow afterwards. i know lots of people here love jazz; gannets plays it almost all the time when he's on https://www.youtube.com/watch?v=wft-He6pI9w. just imagine hearing this right before going to the station to deliver a nuke

or alternatively to set the overall tone for the game
https://www.youtube.com/watch?v=_L-CYkXmJzw

and also, if you don't like it, just use the button to turn it off like every other server has