Added server list updates, and added lobby

- Server list updates when a server is added/removed
- Player can host a server
- Lobby view shows players connected

Tags: #pair[mra106, hyi25] #story[1245]

src/main/java/seng302/App.java

@@ -86,9 +86,6 @@ public class App extends Application {
         primaryStage.show();
 
         primaryStage.setOnCloseRequest(e -> {
-//            ClientPacketParser.appClose();
-//            ClientPacketParser.appClose();
-
 
             try {
                 ServerAdvertiser.getInstance().unregister();
@@ -108,8 +105,6 @@ public class App extends Application {
             parseArgs(args);
         } catch (ParseException e) {
             logger.error("Could not parse command line arguments");
-        } catch (IOException e) {
-            e.printStackTrace();
         }
 
         launch(args);