implement PCM mode (still have to check deblk,SAO, and intra-pred)
fix intra-pred mode decision when using PCM mode
handle PCM in deblocking and SAO
set YUV output filename with function call
initialize pcm parameters when pcm is not enabled in sps
improvement add_task() by lock free circle queue

circle queue may lost a little cache performance, but reduce memove
Merge branch 'dirk0'