Optimize Faust item access for matfaust and pyfaust.

src/faust_linear_operator/CPU/faust_TransformHelper.h

src/faust_linear_operator/CPU/faust_TransformHelper.hpp

src/faust_linear_operator/GPU2/faust_TransformHelper_gpu.h

src/faust_linear_operator/GPU2/faust_TransformHelper_gpu.hpp

src/faust_linear_operator/faust_TransformHelperGen.h

src/faust_linear_operator/faust_TransformHelperGen.hpp

wrapper/matlab/+matfaust/@Faust/Faust.m

wrapper/matlab/src/faust_get_item.h

wrapper/matlab/src/faust_get_item.hpp

wrapper/matlab/src/mexFaust.cpp.in

wrapper/python/pyfaust.py

wrapper/python/src/FaustCoreCpp.h

wrapper/python/src/FaustCoreCpp.hpp

wrapper/python/src/FaustCoreGenCy.pxd.in

wrapper/python/src/_FaustCoreGen.pyx.in