Refactor bilateral filter code (lossless)

source/Lib/CommonLib/BilateralFilter.cpp

source/Lib/CommonLib/BilateralFilter.h

source/Lib/CommonLib/CommonDef.h

source/Lib/CommonLib/Contexts.cpp

source/Lib/CommonLib/Contexts.h

source/Lib/CommonLib/InterPrediction.cpp

source/Lib/CommonLib/Picture.cpp

source/Lib/CommonLib/Picture.h

source/Lib/CommonLib/SampleAdaptiveOffset.cpp

source/Lib/CommonLib/SampleAdaptiveOffset.h

source/Lib/CommonLib/TypeDef.h

source/Lib/CommonLib/x86/BilateralFilterX86.h

source/Lib/DecoderLib/CABACReader.cpp

source/Lib/DecoderLib/CABACReader.h

source/Lib/DecoderLib/DecSlice.cpp

source/Lib/EncoderLib/CABACWriter.cpp

source/Lib/EncoderLib/CABACWriter.h

source/Lib/EncoderLib/EncCu.cpp

source/Lib/EncoderLib/EncGOP.cpp

source/Lib/EncoderLib/EncSampleAdaptiveOffset.cpp