Created Boat bumper logic. Refactored logic for powering up / dpwn

YachtEventType: Added some new events, a generic power down event and a bumper_crash event for an affected boat
GameState: Implemented boat bumper logic
MessageFactory: Made new messages for powerdown and status effect
ClientYacht: Had to create another powerDown functional interface to inform the race view controller when to turn off the icon
RaceViewController/GameClient: Now waits for a message about powering down before turning off rather than waiting time client side

#story[1293]

src/main/java/seng302/model/token/Token.java

@@ -39,4 +39,11 @@ public class Token extends GeoPoint {
         tokenTypeList.remove(TokenType.RANDOM);
         tokenType = tokenTypeList.get(random.nextInt(tokenTypeList.size()));
     }
+
+    /**
+     * Exists for testing purposes only
+     */
+    public void assignType(TokenType tokenType) {
+        this.tokenType = tokenType;
+    }
 }