Merge branch 'refactor_log2' into 'master'

source/Lib/CommonLib/ChromaFormat.h

source/Lib/CommonLib/CodingStructure.cpp

source/Lib/CommonLib/CommonDef.h

source/Lib/CommonLib/ContextModelling.cpp

source/Lib/CommonLib/DepQuant.cpp

source/Lib/CommonLib/Hash.cpp

source/Lib/CommonLib/Hash.h

source/Lib/CommonLib/InterPrediction.cpp

source/Lib/CommonLib/IntraPrediction.cpp

source/Lib/CommonLib/MatrixIntraPrediction.cpp

source/Lib/CommonLib/Quant.cpp

source/Lib/CommonLib/QuantRDOQ.cpp

source/Lib/CommonLib/RdCost.cpp

source/Lib/CommonLib/RdCost.h

source/Lib/CommonLib/Reshape.cpp

source/Lib/CommonLib/Rom.cpp

source/Lib/CommonLib/Rom.h

source/Lib/CommonLib/Slice.h

source/Lib/CommonLib/TrQuant.cpp

source/Lib/CommonLib/UnitPartitioner.cpp