Implemented wake lines

- Changed heading calculation in event class
- The boats now go to the marker, rather than the center of a gate

Tags: #story[466]

src/main/java/seng302/models/Boat.java

@@ -14,6 +14,7 @@ public class Boat {
     private double distanceToNextMark;
     private Color color;
     private int markLastPast;
+    private double heading;
 
     public Boat(String teamName) {
         this.teamName = teamName;
@@ -110,4 +111,12 @@ public class Boat {
     public int getMarkLastPast() {
         return markLastPast;
     }
+
+    public void setHeading(double heading){
+        this.heading = heading;
+    }
+
+    public double getHeading(){
+        return this.heading;
+    }
 }