Pass arguments by reference

src/client.cpp

src/client.h

src/connection.cpp

src/content_sao.cpp

src/content_sao.h

src/convert_json.cpp

src/convert_json.h

src/exceptions.h

src/guiFormSpecMenu.h

src/mods.h

src/script/cpp_api/s_base.cpp

src/server.cpp

src/server.h

src/sound_openal.cpp