Rename variable MaxBTDepth

cfg/encoder_intra_vtm.cfg

cfg/encoder_lowdelay_P_vtm.cfg

cfg/encoder_lowdelay_vtm.cfg

cfg/encoder_randomaccess_vtm.cfg

...nfigExamples/encoder_randomaccess_vtm_RasterScanSlice.cfg

...figExamples/encoder_randomaccess_vtm_RectangularSlice.cfg

...gExamples/encoder_randomaccess_vtm_SingleTilePerSlice.cfg

source/App/EncoderApp/EncApp.cpp

source/App/EncoderApp/EncAppCfg.cpp

source/App/EncoderApp/EncAppCfg.h

source/Lib/CommonLib/Slice.cpp

source/Lib/CommonLib/Slice.h

source/Lib/DecoderLib/VLCReader.cpp

source/Lib/EncoderLib/EncCfg.h

source/Lib/EncoderLib/EncLib.cpp

source/Lib/EncoderLib/EncSlice.cpp

source/Lib/EncoderLib/VLCWriter.cpp