moved wsf_extension inside wsf/extension as wsf/wsf_extension.ecf

added wsf/session as wsf/wsf_session.ecf
In descendants of WSF_HANDLER , we can keep the result of new_mapping as WSF_ROUTER_MAPPING

library/server/wsf/session/wsf_session_data.e

@@ -0,0 +1,27 @@
+note
+	description: "Summary description for {WSF_SESSION_DATA}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	WSF_SESSION_DATA
+
+inherit
+	HASH_TABLE [detachable ANY, READABLE_STRING_32]
+
+create
+	make
+
+feature -- Access
+
+	expiration: detachable DATE_TIME
+
+feature -- Element change
+
+	set_expiration (dt: like expiration)
+		do
+			expiration := dt
+		end
+
+end