lowres: move m_qpAqOffset from TComPic to Lowres
add methods to convert qpAqoffsets to qscale
lowres: Add states to store weighted Aq costs per frame.
lowres: initialize satdCost to -1
Merge with stable
rc: Bug fixes for ABR.

remove uninitialized local variables and use values from cfg.param.rc as required.
TEncCu: nits
Merge with stable

--HG--
extra : amend_source : eafa09247f4310e78c1005dbe1852ce9569dc882
intra-sse3.cpp: replace intraPredAng8x8 vector class function with intrinsic
intra-sse3.cpp: replace intraPredAng32x32 vector class function with intrinsic
intra: move 32x32 angular prediction function into non-vector portion
intra: rename intra-sse3.cpp to intra-ssse3.cpp

--HG--
rename : source/common/vec/intra-sse3.cpp => source/common/vec/intra-ssse3.cpp
pixel: converted some sad_avx2 vector class functions to intrinsic
slicetype: calculate weighted frame costs for Aq
pixel: converted sad_avx2_x4_32 vector class to intrinsic
pixel: converted sad_avx2_x4_64 vector class to intrinsic
pixel: remove vector class include from pixel-avx2.cpp
intra-ssse3: intra angular 8x8 vector to intrinsic
intra: converted intraPredAng16x16 vector class functin to intrinsic
Fix memory write beyond bound bug in intraPredAng8x8()