JVET-O0925: simplifications of MIP

source/Lib/CommonLib/Common.h

source/Lib/CommonLib/CommonDef.h

source/Lib/CommonLib/IntraPrediction.cpp

source/Lib/CommonLib/MatrixIntraPrediction.cpp

source/Lib/CommonLib/MatrixIntraPrediction.h

source/Lib/CommonLib/MipData.h

source/Lib/CommonLib/Rom.cpp

source/Lib/CommonLib/Rom.h

source/Lib/CommonLib/TrQuant.cpp

source/Lib/CommonLib/TypeDef.h

source/Lib/CommonLib/UnitTools.cpp

source/Lib/CommonLib/UnitTools.h

source/Lib/DecoderLib/CABACReader.cpp

source/Lib/EncoderLib/CABACWriter.cpp

source/Lib/EncoderLib/IntraSearch.cpp

source/Lib/EncoderLib/IntraSearch.h