LibC: Rewrite all the headers.

We now have more or less posix issue 2018 conforming libc headers.

This was a really time consuming and boring operation but it had to
be done.

Now we get to actually start implementing libc :)

libc/printf_impl.cpp

@@ -1,5 +1,6 @@
 #include <BAN/Traits.h>
 #include <BAN/Math.h>
+#include <bits/printf.h>
 #include <ctype.h>
 #include <errno.h>
 #include <math.h>