Spun off Locatable interface to make collision code more reusable

#story[1100]

racevisionGame/src/main/java/mock/model/RaceServer.java

@@ -2,10 +2,8 @@ package mock.model;
 
 import network.Messages.*;
 import network.Messages.Enums.BoatLocationDeviceEnum;
-import network.Utils.AC35UnitConverter;
 import shared.model.Bearing;
 import shared.model.CompoundMark;
-import shared.model.Constants;
 import shared.model.Mark;
 
 import java.util.ArrayList;
@@ -127,8 +125,8 @@ public class RaceServer {
 
         BoatLocation boatLocation = new BoatLocation(
                 boat.getSourceID(),
-                boat.getCurrentPosition().getLatitude(),
-                boat.getCurrentPosition().getLongitude(),
+                boat.getPosition().getLatitude(),
+                boat.getPosition().getLongitude(),
                 this.boatLocationSequenceNumber,
                 BoatLocationDeviceEnum.RacingYacht,
                 boat.getBearing(),