Calculation of upwind downwind leg given a boat, wind and next mark now works. created GeometryUtils class

Can accurately calculate if a boat is going upwind or downward using a line function for the wind vector from the gate and the boat position from the gate.

Requires knowledge of the next mark which requires the boat to have passed a mark. This could be fixed by extracting the leg number from the race status packet and mapping these to gates in an initalisation step

tags: #story[956]

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

@@ -161,4 +161,8 @@ public class MarkGroup extends Group {
             idArray[i++] = mark.getId();
         return idArray;
     }
+
+    public Mark getMainMark() {
+        return mainMark;
+    }
 }