Fix: MP1-4083 - Audio renderer can deadlock on stop

Fixed threading in the logger implementation

MPAR version 1.1.6
Fixed code review findings
http://issues.team-mediaportal.com/fisheye/cru/MP1-3#CFR-30

+review MP1-3
Merge remote-tracking branch 'remotes/origin/BUG-4083-Audio_renderer_can_deadlock_on_stop'