Improved QPC queries performance by 50% in EVR & MPAR

- Removed workaround for old / broken HW that required the thread affinity to be kept on same CPU/core http://msdn.microsoft.com/en-us/library/ms644904(VS.85).aspx
Merge branch 'EXP-Audio_Renderer_Timekeeping_Refactoring' of https://github.com/tourettes/MediaPortal-1 into EXP-Audio_Renderer_Timekeeping_Refactoring
Merge branch 'EXP-Audio_Renderer_Timekeeping_Refactoring' of https://github.com/tourettes/MediaPortal-1 into EXP-Audio_Renderer_Timekeeping_Refactoring
Improved locking performance in reference clock generation