JVET-Q0820: ACT bug fixes and reversible ACT transform

source/App/EncoderApp/EncAppCfg.cpp

source/Lib/CommonLib/Buffer.cpp

source/Lib/CommonLib/Buffer.h

source/Lib/CommonLib/CommonDef.h

source/Lib/CommonLib/LoopFilter.cpp

source/Lib/CommonLib/Quant.cpp

source/Lib/CommonLib/Quant.h

source/Lib/CommonLib/RdCost.cpp

source/Lib/CommonLib/TypeDef.h

source/Lib/DecoderLib/DecCu.cpp

source/Lib/DecoderLib/VLCReader.cpp

source/Lib/EncoderLib/EncCu.cpp

source/Lib/EncoderLib/InterSearch.cpp

source/Lib/EncoderLib/IntraSearch.cpp

source/Lib/EncoderLib/VLCWriter.cpp