added and option to swap between css files in the title pane

#pair[zwu18, hba56]
#story[1087]

racevisionGame/src/main/java/visualiser/app/App.java

@@ -45,6 +45,7 @@ public class App extends Application {
         stage.setScene(scene);
         stage.setTitle("RaceVision - Team 7");
         stage.getIcons().add(new Image(getClass().getClassLoader().getResourceAsStream("images/SailIcon.png")));
+        mc.startCss();
         stage.show();
     }
 }