Added Memory Paging + Formating Fixes

Memory paging was "fixed", there was previously a stub because I was
working out some compilation issue. Turns out, I had extern keyword
called to the structs. Stupidly, I forgot to declare the struct in the
header the whole time. Luckily that worked itself out, and now vga
memory is mapped.

kernel/klibc/string.c

@@ -1,4 +1,4 @@
-#include <string.h>
+#include <klibc/string.h>
 
 size_t
 strlen(const char* str)