ClassIDs are now actually typeinfo name pointers.

I'll see, next, about the `instanceOf` thing, and going with
more normal RTTI routes.

dw/image.hh

@@ -145,7 +145,7 @@ protected:
    //core::Iterator *iterator (Content::Type mask, bool atEnd);
 
 public:
-   static int CLASS_ID;
+   static std::intptr_t CLASS_ID;
 
    Image(const char *altText);
    ~Image();