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

scene/resources/shape_2d.h

@@ -31,7 +31,7 @@
 #ifndef SHAPE_2D_H
 #define SHAPE_2D_H
 
-#include "core/resource.h"
+#include "core/io/resource.h"
 
 class Shape2D : public Resource {
 	GDCLASS(Shape2D, Resource);