Revision 273432

Added an alternate implementation, so we can override default
behavior and control the creation.

This will work for all code that checks instanceof, but
will obviously fail if any code explicitely looks at the class
name ( which is very unlikely - so far no code did that in the
gump run or otherwise ).

The UnknownElement2/RuntimeConfigurable2 will be further refactored
to make them more independent of the XML representation and
have a cleaner API. All behavior will be moved out of the XML
processor and into this pair. Of course, full backward compat will
be provided.