Updated is_valid_character, using NATURAL_32 as an argument to avoid multiple conversions.

Updated add_cookie, added features has_cookie_name and is_cookie line to avoid the use of
STRING.split and STRING.start_with.

library/server/wsf/tests/src/wgi_response_null.e

@@ -124,7 +124,7 @@ feature -- Error reporting
 			end
 		end
 
-feature {EQA_TEST_SET} -- Implementation: Access
+feature -- Implementation: Access
 
 	output: STRING
 			-- Server output channel