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/mono/editor/script_class_parser.cpp

@@ -30,8 +30,8 @@
 
 #include "script_class_parser.h"
 
-#include "core/map.h"
 #include "core/os/os.h"
+#include "core/templates/map.h"
 
 #include "../utils/string_utils.h"