MPDStatus: Convert if conditional block to switch.
MPDStatus: Convert if conditional block to switch.

This patch also changes the behaviour of reading the response lines, with split
and a string array, simplifying the array and easing reading.

abarisain/dmix,0359xiaodong/dmix,hurzl/dmix,hurzl/dmix,abarisain/dmix,joansmith/dmix,joansmith/dmix,jcnoir/dmix,jcnoir/dmix,0359xiaodong/dmix