Fixed the bug where the race clock wasn't visible some of the time.

It appears to have been due to a threading/javaFX thread issue with prop1.bind(prop2).

visualiser/src/main/java/seng302/Controllers/RaceController.java

@@ -1,6 +1,7 @@
 package seng302.Controllers;
 
 
+import javafx.application.Platform;
 import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
 import javafx.scene.control.*;
@@ -118,7 +119,14 @@ public class RaceController extends Controller {
 
         //Initialize save annotation array, fps listener, and annotation listeners
         timeZone.setText(raceClock.getTimeZone());
-        timer.textProperty().bind(raceClock.durationProperty());
+
+        //RaceClock.duration isn't necessarily being changed in the javaFX thread, so we need to runlater the update.
+        raceClock.durationProperty().addListener((observable, oldValue, newValue) -> {
+            Platform.runLater(() -> {
+                timer.setText(newValue);
+            });
+        });
+
         initializeFPS();
         initializeAnnotations();