partial move read_parameters to cpp files

bfps/DNS.py

bfps/cpp/full_code/NSVE.cpp

bfps/cpp/full_code/NSVEparticles.cpp

bfps/cpp/full_code/code_base.cpp

bfps/cpp/full_code/code_base.hpp

bfps/cpp/full_code/direct_numerical_simulation.cpp

bfps/cpp/full_code/direct_numerical_simulation.hpp

setup.py