Fix add_item_to_sonos_playlist to use the new data structures, closes #308
Fix add_item_to_sonos_playlist to use the new data structures, closes #308

bwhaley/SoCo,petteraas/SoCo,TrondKjeldas/SoCo,dajobe/SoCo,simonalpha/SoCo,DPH/SoCo,TrondKjeldas/SoCo,meska/SoCo,SoCo/SoCo,petteraas/SoCo,SoCo/SoCo,DPH/SoCo,dundeemt/SoCo,dsully/SoCo,lawrenceakka/SoCo,intfrr/SoCo,bwhaley/SoCo,lawrenceakka/SoCo,KennethNielsen/SoCo,KennethNielsen/SoCo,fxstein/SoCo,meska/SoCo,fgend31/SoCo,dajobe/SoCo,TrondKjeldas/SoCo,fgend31/SoCo,intfrr/SoCo,fxstein/SoCo,dsully/SoCo,flavio/SoCo,petteraas/SoCo,flavio/SoCo,bwhaley/SoCo,simonalpha/SoCo,dundeemt/SoCo