When iOS controls via QConnect without sending a queue, the local
QbzCore queue is empty so auto-advance fails. Now we extract next_track
from each SetState command, store it in DaemonCore, and the orchestrator
uses it as a fallback when the local queue is empty.
Also adds a periodic state reporter (every 2s) so iOS knows the
renderer's actual state (playing/paused/stopped + position). Without
this iOS thinks the daemon is still playing after a track ends.
Bump version to 0.1.9.
cc
vicrodh
64a42fd156