Moved all .c in .h
(Lib is now header only)
Even if macro.h is included multiple time, do not redefine them
Order is important !
(Astyle'd)
Merged Stack and Vector.
Only need one of them, and vector is the most generic container (like stack, queue, ...)

And removed all xlk_ prefix
(Useless minor fix)
Renamed folder from xlk_cutils/ to cutils/