Merge branch 'structure_cleanup' into 'master'

cfg/encoder_intra_vtm.cfg

cfg/encoder_lowdelay_P_vtm.cfg

cfg/encoder_lowdelay_vtm.cfg

cfg/encoder_randomaccess_vtm.cfg

source/App/EncoderApp/EncApp.cpp

source/App/EncoderApp/EncAppCfg.cpp

source/App/EncoderApp/EncAppCfg.h

source/Lib/CommonLib/CodingStructure.cpp

source/Lib/CommonLib/CommonDef.h

source/Lib/CommonLib/ContextModelling.cpp

source/Lib/CommonLib/DepQuant.cpp

source/Lib/CommonLib/IntraPrediction.cpp

source/Lib/CommonLib/LoopFilter.cpp

source/Lib/CommonLib/RdCost.cpp

source/Lib/CommonLib/RdCost.h

source/Lib/CommonLib/Slice.cpp

source/Lib/CommonLib/Slice.h

source/Lib/CommonLib/TrQuant.cpp

source/Lib/CommonLib/TrQuant.h

source/Lib/CommonLib/TypeDef.h