remove prefix in variables, and put "{" in a new line (when it was not)

source/Lib/CommonLib/Buffer.cpp

source/Lib/CommonLib/Picture.cpp

source/Lib/CommonLib/Picture.h

source/Lib/CommonLib/SEIColourTransform.cpp

source/Lib/DecoderLib/DecLib.cpp

source/Lib/DecoderLib/DecLib.h