JVET-O0432: LMCS encoder improvement

cfg/encoder_intra_vtm.cfg

cfg/encoder_lowdelay_P_vtm.cfg

cfg/encoder_lowdelay_vtm.cfg

cfg/encoder_randomaccess_vtm.cfg

cfg/per-class/classH1.cfg

cfg/per-class/classH2.cfg

doc/software-manual.tex

source/App/EncoderApp/EncAppCfg.cpp

source/App/EncoderApp/EncAppCfg.h

source/Lib/CommonLib/RdCost.cpp

source/Lib/CommonLib/Slice.h

source/Lib/CommonLib/TypeDef.h

source/Lib/EncoderLib/EncGOP.cpp

source/Lib/EncoderLib/EncReshape.cpp

source/Lib/EncoderLib/EncReshape.h