Adopted convention name and value or values for WSF_VALUE and descendant (WSF_STRING ...)

kept `key' as redirection, and also string as obsolete redirection.
Router: provide a way to pass the request methods without using manifest string, thanks to WSF_ROUTER_METHODS
  so instead of using manifest array or manifest strings, just create an instance of WSF_ROUTER_METHODS
  for convenience, WSF_ROUTER provides a few `methods_...' returning prebuilt WSF_ROUTER_METHODS objects
Improved code related to unicode handling in URL, and parameters (before the framework was doing too much)

library/text/encoder/src/utf8_url_encoder.e

@@ -45,11 +45,8 @@ feature -- Encoder
 	encoded_string (s: READABLE_STRING_32): STRING_8
 			-- URL-encoded value of `s'.
 		do
-			Result := Precursor (s)
-			if not has_error then
-				Result := utf32_to_utf8 (Result)
-				has_error := not last_conversion_successful
-			end
+			Result := utf32_to_utf8 (s)
+			Result := Precursor (Result)
 		end
 
 	partial_encoded_string (s: READABLE_STRING_32; a_ignore: ARRAY [CHARACTER]): READABLE_STRING_8
@@ -58,7 +55,6 @@ feature -- Encoder
 			Result := Precursor (s, a_ignore)
 			if not has_error then
 				Result := utf32_to_utf8 (Result)
-				has_error := not last_conversion_successful
 			end
 		end