Initial check in of support for upcasting during function invocation. No examples or tests are checked in yet. Some reorg was necessary to get things compiling in the right order. Is not currently thread safe and probably does not work properly across module boundaries

include/chaiscript/dispatchkit/operators.hpp

@@ -152,7 +152,7 @@ namespace chaiscript
         return (-l);
 #pragma warning(pop)
 #else
-        return (-1);
+        return (-l);
 #endif
       }