PSNR: row-by-row PSNR measurement with SSD accumulators in TComPic
y4m: make file reading threaded
pixel-sse41.cpp: Modified PROCESS_SSE_SS4x1 macro with faster intrinsics
primitives: add chroma partition widths and interpolation function def
cleanup:reduce ContextModel3DBuffer to 1D
cabac: writeByte() for faster CABAC output
faster grow buffer size to reduce number of memcpy
api: pass presentation timestamp through the encoder

--HG--
extra : amend_source : f26057eb1b5471e0b06ff80da72ea3c3233a761e
cmake: fix gcc 16bpp build