remapper: new method to read a string in traced process
remapper: quicker method to test if one byte is zero in a word
remapper: user proper register when tracing a 32 bit process

when tracing a 32 bit process the first argument of the syscall
is in RBX and not in RDI (as for 64bit process)
remapper: rename debug.h in defs.h
remapper: move defines in defs.h
remapper: move define and declaration of personality in defs.h
remapper: use IS_64BITS macro
remapper: move all definitions in defs.h
remapper: define syscall number in defs.h