Renamed WGI_STANDALONE_CONNECTOR_ACCESS as WGI_STANDALONE_CONNECTOR_EXPORTER.

Isolate the websocket implementation in descendant of {WEB_SOCKET_EVENT_I}.
Added very simple echo websocket example.
+ code cleaning.

library/server/ewsgi/connectors/standalone/src/wgi_standalone_connector_exporter.e

@@ -6,6 +6,6 @@ note
 	revision: "$Revision$"
 
 deferred class
-	WGI_STANDALONE_CONNECTOR_ACCESS
+	WGI_STANDALONE_CONNECTOR_EXPORTER
 
 end

library/server/ewsgi/connectors/standalone/src/wgi_standalone_input_stream.e

@@ -24,7 +24,7 @@ feature {NONE} -- Initialization
 			set_source (a_source)
 		end
 
-feature {WGI_STANDALONE_CONNECTOR, WGI_SERVICE, WGI_STANDALONE_CONNECTOR_ACCESS} -- Standalone
+feature {WGI_STANDALONE_CONNECTOR, WGI_SERVICE, WGI_STANDALONE_CONNECTOR_EXPORTER} -- Standalone
 
 	set_source (i: like source)
 		do