Mark drawing moved to MarkGroup class. RaceObject and it's sub classes now describe

all functionality required for a on screen object. Improved wakes. Branch currently
untested.

#story[812, 820] #refactor #implement.

src/main/java/seng302/models/Wake.java

@@ -0,0 +1,37 @@
+package seng302.models;
+
+import javafx.scene.paint.Color;
+import javafx.scene.shape.Arc;
+import javafx.scene.shape.ArcType;
+
+/**
+ * Created by CJIRWIN on 27/04/2017.
+ */
+class Wake extends Arc {
+
+    private static int VELOCITY_SCALE_FACTOR = 3;
+    private static int MAX_LIFESPAN = 180;
+    private static double LIFESPAN_PER_FRAME = 1.0 / MAX_LIFESPAN;
+
+    private double velocityX;
+    private double velocityY;
+    private int lifespan = MAX_LIFESPAN;
+
+    Wake (double startingX, double startingY, double velocityX, double velocityY) {
+        super(startingX, startingY, 25, 15, 160, 40);
+        super.setFill(Color.BLUE);
+        super.setType(ArcType.OPEN);
+        super.setStrokeWidth(2.0);
+        this.velocityX = -velocityX;
+        this.velocityY = -velocityY;
+    }
+
+    boolean updatePosition (double timeInterval) {
+        lifespan--;
+        super.setLayoutX(super.getLayoutX() + velocityX * timeInterval);
+        super.setLayoutX(super.getLayoutX() + velocityX * timeInterval);
+        super.setOpacity(LIFESPAN_PER_FRAME * lifespan * super.getOpacity());
+        return lifespan == 0;
+    }
+
+}