Reorganized core/ directory, it was too fatty already

-Removed FuncRef, since Callable makes it obsolete
-Removed int_types.h as its obsolete in c++11+
-Changed color names code

drivers/unix/dir_access_unix.cpp

@@ -32,9 +32,9 @@
 
 #if defined(UNIX_ENABLED) || defined(LIBC_FILEIO_ENABLED)
 
-#include "core/list.h"
 #include "core/os/memory.h"
-#include "core/print_string.h"
+#include "core/string/print_string.h"
+#include "core/templates/list.h"
 
 #include <errno.h>
 #include <stdio.h>