Rename loop filter appropriately to deblocking filter

cfg/encoder_intra_vtm.cfg

cfg/encoder_lowdelay_P_vtm.cfg

cfg/encoder_lowdelay_vtm.cfg

cfg/encoder_randomaccess_vtm.cfg

cfg/encoder_randomaccess_vtm_gop16.cfg

cfg/lossless/lossless.cfg

cfg/lossless/lossless_mixed.cfg

doc/software-manual.tex

source/App/EncoderApp/EncApp.cpp

source/App/EncoderApp/EncAppCfg.cpp

source/App/EncoderApp/EncAppCfg.h

source/Lib/CommonLib/DeblockingFilter.cpp

source/Lib/CommonLib/DeblockingFilter.h

source/Lib/DecoderLib/DecLib.cpp

source/Lib/DecoderLib/DecLib.h

source/Lib/EncoderLib/EncCfg.h

source/Lib/EncoderLib/EncCu.cpp

source/Lib/EncoderLib/EncCu.h

source/Lib/EncoderLib/EncGOP.cpp

source/Lib/EncoderLib/EncGOP.h