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/io/xml_parser.h

@@ -31,10 +31,10 @@
 #ifndef XML_PARSER_H
 #define XML_PARSER_H
 
+#include "core/object/reference.h"
 #include "core/os/file_access.h"
-#include "core/reference.h"
-#include "core/ustring.h"
-#include "core/vector.h"
+#include "core/string/ustring.h"
+#include "core/templates/vector.h"
 
 /*
   Based on irrXML (see their zlib license). Added mainly for compatibility with their Collada loader.