Removed any (put|write)_file_content from the WSF_ or WGI_ OUTPUT classes

Now DEFAULT_SERVICE has to be created instead of inherited.
   - This seems to be better for new user, and this avoid potential conflict and difference when inheriting between the various DEFAULT_SERVICE implementation.
   - remember that DEFAULT_SERVICE, is mainly to help the user to build its very first service.
Use READABLE_STRING_8 as argument whenever it is possible.
Added WSF_RESPONSE_MESSAGE, and WSF_RESPONSE.put_response (a_response_message)
Now WSF_RESPONSE inherit from WGI_RESPONSE

library/protocol/http/src/http_header.e

@@ -193,6 +193,12 @@ feature -- Content related header
 			put_header_key_value ({HTTP_HEADER_NAMES}.header_transfer_encoding, a_enc)
 		end
 
+	put_transfer_encoding_binary
+			-- Put "Transfer-Encoding: binary" header
+		do
+			put_transfer_encoding ("binary")
+		end
+
 	put_transfer_encoding_chunked
 			-- Put "Transfer-Encoding: chunked" header
 		do