Remove code related to cross-component prediction

source/Lib/CommonLib/Contexts.cpp

source/Lib/CommonLib/Contexts.h

source/Lib/CommonLib/CrossCompPrediction.cpp

source/Lib/CommonLib/CrossCompPrediction.h

source/Lib/CommonLib/Quant.cpp

source/Lib/CommonLib/QuantRDOQ.cpp

source/Lib/CommonLib/TrQuant.cpp

source/Lib/DecoderLib/DecCu.cpp

source/Lib/EncoderLib/InterSearch.h

source/Lib/EncoderLib/IntraSearch.h