New design for self documented router.

The documentation is built only on demand.
A mapping entry can be hidden for the documentation
One can change the status code when building itself the WSF_ROUTER_SELF_DOCUMENTATION_MESSAGE

library/server/wsf/router/documentation/wsf_self_documented_handler.e

@@ -9,7 +9,7 @@ deferred class
 
 feature -- Documentation
 
-	documentation: detachable READABLE_STRING_32
+	mapping_documentation (m: WSF_ROUTER_MAPPING): WSF_ROUTER_MAPPING_DOCUMENTATION
 		deferred
 		end