JVET-AI0074 multi-ratio RPR encoder and NNSR

cfg/nn-based/nnsr/nnsr.cfg

cfg/nn-based/nnsr/nnsr_classA_multiRatio.cfg

cfg/nn-based/nnsr/nnsr_classA_singleRatio.cfg

models/super_resolution/NNVC_SR_multiratio_int16.sadl

source/App/DecoderApp/DecApp.cpp

source/App/EncoderApp/EncApp.cpp

source/App/EncoderApp/EncAppCfg.cpp

source/App/EncoderApp/EncAppCfg.h

source/Lib/CommonLib/CommonDef.h

source/Lib/CommonLib/NNSRUnified.cpp

source/Lib/CommonLib/NNSRUnified.h

source/Lib/CommonLib/Picture.cpp

source/Lib/CommonLib/Picture.h

source/Lib/CommonLib/TypeDef.h

source/Lib/EncoderLib/EncCfg.h

source/Lib/EncoderLib/EncGOP.cpp

source/Lib/EncoderLib/EncLib.cpp

source/Lib/Utilities/VideoIOYuv.cpp

source/Lib/Utilities/VideoIOYuv.h

...ning/training_scripts/NN_SR_Multiratio/common_config.json