It could happen if the input_thread_t die before/without sending any
meta event.

It avoid locking the whole playlist_t when fetching art, which can take a lot
of time...

Until a valid icon is designed/found, I used a DRM text label.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

stats: Add stream quality counters to Qt4 stastics by counting corrupted blocks and discontinuities found.

Note the quality counters are mere indications and not exact reporting of how much blocks/discontinuity really occured. It will only tell you how often it is noticed.

(still not handling errors correctly)

Conflicts:

	modules/access/directory.c
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

One useless thread gone (the new subsystem does not need a thread).