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/gdscript/gdscript_tokenizer.h

@@ -31,10 +31,10 @@
 #ifndef GDSCRIPT_TOKENIZER_H
 #define GDSCRIPT_TOKENIZER_H
 
-#include "core/list.h"
-#include "core/set.h"
-#include "core/variant.h"
-#include "core/vector.h"
+#include "core/templates/list.h"
+#include "core/templates/set.h"
+#include "core/templates/vector.h"
+#include "core/variant/variant.h"
 
 class GDScriptTokenizer {
 public: