TEncSeach: add alignment to bidir output buffer

fixes crash in x265_pixel_avg_w16_sse2 from aligned writes to the output buffer
pixel: modified sse_sp8 with a comman macro SSE_SP8x1
pixel: replace sse_sp16 vector class with intrinsic
pixel: replace sse_sp24 vector class with intrinsic
pixel: replace sse_sp32 vector class with intrinsic
pixel: replace sse_sp48 vector class with intrinsic
pixel: replace sse_sp64 vector class with intrinsic
sse: move intrinsic functions to pixel-sse41.cpp
ipfilter-ssse3.cpp: Replace filterConvertShortToPel vector class function with intrinsic.
ipfilter-ssse3.cpp: Replace filterConvertPelToShort vector class function with intrinsic.
ipfilter: remove vector class headers from ipfilter-ssse3.cpp
sse: move last SSE function into vector-class section of pixel-sse41.cpp
tcomslice: removed unused set methods in TComReferencePictureSet class
tcomslice:remove unused set methods
remove unused <algorithm> includes
tcomtrquant:remove unused methods