Created wsf_extension, and moved some classes from wsf to wsf_extension

WSF_HANDLER_HELPER
   WSF_RESOURCE_HANDLER_HELPER
   WSF_HANDLER_ROUTES_RECORDER

library/server/wsf/router/misc/wsf_format_utility.e

@@ -60,6 +60,8 @@ feature -- Access
 feature {NONE} -- Implementation
 
 	string_in_array (arr: ARRAY [STRING]; s: STRING): BOOLEAN
+			-- Is `s' in array `arr' ?
+			--| using `{STRING}.same_string (..)'
 		local
 			i,n: INTEGER
 		do