Support reference injection with Wicket

As described by Teemu:

I am not a Wicket expert but there is a page about Spring injection for Wicket:
https://cwiki.apache.org/WICKET/spring.html

I think that the same approach might work for SCA and Fabric3
injection as well. Just replace @SpringBean with @Reference and create
the necessary Wicket thingies.
It actually says on that page "This technology can also be used to
inject non-spring dependencies like JNDI or EJB3 beans. All it takes
is a simple implementation of IFieldValueFactory and
IProxyTargetLocator" (in section Beyond Spring).

I guess it would need something like this in the application class and
would not be fully IoC with just an annotation (because of need for
proxies because of page serialization):

class MyApplication extends WebApplication {
public void init()

}

Source code of that Spring injection can be found here:
https://fisheye6.atlassian.com/browse/wicket/trunk/wicket-spring/src/main/java/org/apache/wicket/spring/

I hope this helps.

Best wishes,
Teemu