Loading course mark order from RaceXML

- Re-engineered code to work with the new marks
- Fixed bug where race order wasn't correct (added RacePosition class to fix)
- Rewrote tests to work with new RacePosition class

Tags: #story[1124] (Task 1)

src/main/java/seng302/model/mark/RacePosition.java

@@ -0,0 +1,55 @@
+package seng302.model.mark;
+
+/**
+ * Represents a boats position between two marks
+ */
+public class RacePosition {
+    private Integer positionIndex;
+    private Mark nextMark;
+    private Mark previousMark;
+    private Boolean isFinishingLeg;
+
+    public RacePosition(Integer positionIndex, Mark nextMark, Mark previousMark){
+        this.positionIndex = positionIndex;
+        this.nextMark = nextMark;
+        this.previousMark = previousMark;
+        isFinishingLeg = false;
+    }
+
+    /**
+     * @return The position of the boat (0...number of marks in race - 1)
+     */
+    public Integer getPositionIndex(){
+        return positionIndex;
+    }
+
+    /**
+     * @return The mark the boat is heading to
+     *         will return NULL if this is the finishing legg
+     */
+    public Mark getNextMark(){
+        return nextMark;
+    }
+
+    /**
+     * @return The mark the boat is heading away from,
+     *         Will return NULL if this is the starting leg
+     */
+    public Mark getPreviousMark(){
+        return previousMark;
+    }
+
+    /**
+     * Sets a flag that this is the last leg in the race
+     */
+    public void setFinishingLeg(){
+        isFinishingLeg = true;
+    }
+
+    /**
+     * @return true if this is the last leg in the race
+     */
+    public boolean getIsFinishingLeg() {
+        return isFinishingLeg;
+    }
+}