Added visitor patterns to WSF_VALUE

Handling UTF-8 unencoding for WSF_VALUE ...
Added WSF_TABLE_VALUE to handle list[]=a&list[]=b ...

Library encoder: added UTF8 facilities

library/text/encoder/src/base64.e

@@ -16,7 +16,10 @@ inherit
 
 feature -- Access
 
-	name: STRING = "base64"
+	name: READABLE_STRING_8
+		do
+			create {IMMUTABLE_STRING_8} Result.make_from_string ("base64")
+		end
 
 feature -- Status report