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

core/crypto/crypto_core.h

@@ -31,7 +31,7 @@
 #ifndef CRYPTO_CORE_H
 #define CRYPTO_CORE_H
 
-#include "core/reference.h"
+#include "core/object/reference.h"
 
 class CryptoCore {
 public: