Add the original setup.cpp and setup.h (from the original codebase).
These files were stripped from :
 - useless features : sound (might be added in the future, opengl,
			joystick ...)
 - command line arguments parsing (and the usage function)
 - useless windows preprocessor conditions (WIN32)
Move #include from setup.cpp to setup.h.
Remove useless directories verifiations in st_directory_setup (useless
with the TI nspire).
Update CodingStyle.
Update setup.h and setup.cpp files to match the new coding style.