Implemented WSF_RESPONSE.put_error (...) and related

Added WSF_RESPONSE.put_character
Renamed  WGI_OUTPUT_STREAM.put_character_8 as put_character  to follow style of put_string  (and not put_string_8)
Refactored the WSF_DEFAULT_SERVICE_LAUNCHER
Added WSF_DEFAULT_SERVICE to be more user friendly
Splitted the wsf/default/ libraries to have wsf/connector/... and being able to handle more than one connector in the same application

library/server/ewsgi/specification/stream/wgi_output_stream.e

@@ -37,13 +37,12 @@ feature -- Output
 			end
 		end
 
-	put_character_8 (c: CHARACTER_8)
+	put_character (c: CHARACTER_8)
 			-- Write `c' to output stream.
 			--| Could be redefined for optimization			
 		require
 			is_open_write: is_open_write
-		do
-			put_string (c.out)
+		deferred
 		end
 
 feature -- Specific output