ClassIDs are now actually typeinfo name pointers.

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

dw/ruler.hh

@@ -30,7 +30,7 @@ protected:
                                    core::GettingWidgetAtPointContext *context);
 
 public:
-   static int CLASS_ID;
+   static std::intptr_t CLASS_ID;
 
    Ruler ();
    ~Ruler ();