Large tidying of RaceViewController class. Fixing updating for combo boxes

#story[955]

src/main/java/seng302/models/mark/MarkGroup.java

@@ -1,6 +1,7 @@
 package seng302.models.mark;
 
 import javafx.geometry.Point2D;
+import javafx.scene.CacheHint;
 import javafx.scene.Node;
 import javafx.scene.paint.Color;
 import javafx.scene.shape.Circle;

src/main/java/seng302/models/parsers/StreamParser.java

@@ -24,7 +24,6 @@ import java.util.concurrent.PriorityBlockingQueue;
  * and parsed in by turning the byte arrays into useful data. There are two public static hashmaps
  * that are threadsafe so the visualiser can always access the latest speed and position available
  * Created by kre39 on 23/04/17.
- *
  */
 public class StreamParser extends Thread{