fixed: We can't grab the duration from the streamdetails for stacks
Merge pull request #3699 from arnova/streamdetail_stack_time_fix

fixed: We can't grab the duration from the streamdetails for stacks
[coreSubs] proper fix for cf85bdb , select services list if no subtitles are found
[settings] - add a new rendermethod for corevideo rendering
[osx/mavericks] - on mavericks expose the new render method corevideo to the rendermethod list in gui settings
[osx/mavericks] - on mavericks if user selected corevideo rendering - forece cvbufref render format