ClassIDs are now actually typeinfo name pointers.

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

dw/listitem.cc

@@ -25,13 +25,13 @@
 
 namespace dw {
 
-int ListItem::CLASS_ID = -1;
+std::intptr_t ListItem::CLASS_ID = -1;
 
 ListItem::ListItem (ListItem *ref, bool limitTextWidth):
    AlignedTextblock (limitTextWidth)
 {
    DBG_OBJ_CREATE ("dw::ListItem");
-   registerName ("dw::ListItem", &CLASS_ID);
+   registerName ("dw::ListItem", typeid(*this), &CLASS_ID);
    setRefTextblock (ref);
 }