ClassIDs are now actually typeinfo name pointers.

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

dw/ruler.cc

@@ -26,12 +26,12 @@
 
 namespace dw {
 
-int Ruler::CLASS_ID = -1;
+std::intptr_t Ruler::CLASS_ID = -1;
 
 Ruler::Ruler ()
 {
    DBG_OBJ_CREATE ("dw::Ruler");
-   registerName ("dw::Ruler", &CLASS_ID);
+   registerName ("dw::Ruler", typeid(*this), &CLASS_ID);
 }
 
 Ruler::~Ruler ()