Adapt the stream to each device

Browsing is only half the job; the audio still has to play on hardware that varies wildly in what it accepts. This feature is how MusicBee tailors each stream — and it is shared: it applies both when the Server role serves a track to a browsing device, and when the Control point role plays out to a remote renderer. Two concepts drive it: device profiles (what a device can handle) and the transcoding precedence chain (whether a track is re-encoded at all).