ApplicationPlayer: Sanitize ClosePlayer() and SetPlaySpeed() #3200
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After merging #2896, there was a 4/5 chance for a deadlock in CApplicationPlayer::GetInternal() when stopping video playback if a Python addon constantly polled the HasVideo bools.
When sanitizing SetPlaySpeed() and most importantly ClosePlayer() to also use the shared lock, the problem is gone.
Thanks to @t-nelson for the right hints and pointers to get this fixed!