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

modules/mbedtls/ssl_context_mbedtls.h

@@ -35,7 +35,7 @@
 
 #include "core/os/file_access.h"
 
-#include "core/reference.h"
+#include "core/object/reference.h"
 
 #include <mbedtls/config.h>
 #include <mbedtls/ctr_drbg.h>