Allow a clean shutdown to end in either power off or reboot. Add a
new event SYS_REBOOT to signal it and sys_reboot() to trigger the
event. SYS_REBOOT signals a reboot request and should be listened
for alongside SYS_POWEROFF events.
Change-Id: I99ba7fb5feed2bb5a0a40a274e8466ad74fe3a43
if you skip a track after the halfway point the scrobbler may double post
with slightly different timestamps but the same track info
take a crc of the non-unique part and check against the previously
written track
Change-Id: I676342c4cd76f632131d9cb6d9f7d2f59df357e6
