MP3 and LED

I've pushed out the changes so that MP3s can now be played, and that recording light was being turned on by the "setAVModeSCART" function, which made it very easy to track down what GPIO was controlling that light. Especially after I noticed that the light came on after the shutdown VideoPlayback process happened. So I just backtracked from the endin gof the program, commenting stuff out and rebooting (to turn off the light) until the light didn't come on.