Cleanup of bilateral filter code.

cfg/encoder_lowdelay_P_vtm.cfg

cfg/encoder_lowdelay_vtm.cfg

cfg/encoder_randomaccess_vtm.cfg

cfg/encoder_randomaccess_vtm_gop16.cfg

source/App/DecoderApp/DecApp.cpp

source/App/EncoderApp/EncApp.cpp

source/App/EncoderApp/EncAppCfg.cpp

source/App/EncoderApp/EncAppCfg.h

source/Lib/CommonLib/BilateralFilter.cpp

source/Lib/CommonLib/BilateralFilter.h

source/Lib/CommonLib/CodingStructure.cpp

source/Lib/CommonLib/CodingStructure.h

source/Lib/CommonLib/CommonDef.h

source/Lib/CommonLib/Contexts.cpp

source/Lib/CommonLib/Contexts.h

source/Lib/CommonLib/Picture.cpp

source/Lib/CommonLib/Picture.h

source/Lib/CommonLib/SampleAdaptiveOffset.cpp

source/Lib/CommonLib/SampleAdaptiveOffset.h

source/Lib/CommonLib/Slice.cpp