JVET-O0122 CE7-3.10: Sign context, level mapping of TS residual coding

source/Lib/CommonLib/ContextModelling.cpp

source/Lib/CommonLib/ContextModelling.h

source/Lib/CommonLib/Contexts.cpp

source/Lib/CommonLib/Contexts.h

source/Lib/CommonLib/QuantRDOQ.cpp

source/Lib/CommonLib/QuantRDOQ.h

source/Lib/CommonLib/TypeDef.h

source/Lib/DecoderLib/CABACReader.cpp

source/Lib/EncoderLib/CABACWriter.cpp