ClassIDs are now actually typeinfo name pointers.

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

dw/table.hh

@@ -492,7 +492,7 @@ protected:
    void removeChild (Widget *child);
 
 public:
-   static int CLASS_ID;
+   static std::intptr_t CLASS_ID;
 
    inline static void setAdjustTableMinWidth (bool adjustTableMinWidth)
    { Table::adjustTableMinWidth = adjustTableMinWidth; }