Boats now reverse smoothly when colliding

- Collision objects specify which boat is colliding
- RaceLogic sets up an observable CollisionCommand when collision bubbles up
- Boats now selectively identify observers of collision

#story[1196]

racevisionGame/src/main/java/shared/model/Boat.java

@@ -403,10 +403,6 @@ public class Boat extends Collider {
     public boolean isSailsOut() {
         return sailsOut;
     }
-    public void bounce(double repulsionRadius) {
-        Azimuth reverseAzimuth = Azimuth.fromDegrees(getBearing().degrees() - 180d);
-        setPosition(GPSCoordinate.calculateNewPosition(getPosition(), 2 * repulsionRadius, reverseAzimuth));
-    }
 
     @Override
     public boolean rayCast(Boat boat) {
@@ -416,9 +412,11 @@ public class Boat extends Collider {
     }
 
     @Override
-    public void onCollisionEnter(Boat collider, Collision e) {
+    public void onCollisionEnter(Collision e) {
         if(e.getBearing().degrees() > 270 || e.getBearing().degrees() < 90) {
-            collider.bounce(100);
+            // Notify observers of collision
+            this.setChanged();
+            notifyObservers(e);
         }
     }
 }

racevisionGame/src/main/java/shared/model/Mark.java

@@ -101,7 +101,8 @@ public class Mark extends Collider{
     }
 
     @Override
-    public void onCollisionEnter(Boat collider, Collision e) {
-        collider.bounce(repulsionRadius);
+    public void onCollisionEnter(Collision e) {
+        this.setChanged();
+        notifyObservers(e);
     }
 }