Added abstraction WSF_ROUTED, and WSF_FILTERED.

Added under library/server/obsolete/v0 the previous non concurrent friendly version of EWF/WSF, for backward compatiblity.
Removed WSF_CALLBACK_SERVICE and WSF_TO_WGI_SERVICE which are not need with new EWF.

library/server/wsf/router/wsf_routed_execution.e

@@ -12,6 +12,8 @@ inherit
 			initialize
 		end
 
+	WSF_ROUTED
+
 feature {NONE} -- Initialize
 
 	initialize