Removed unused classes and imports

- Removed references to Constants class from other classes and tests
- ArrowController, Constants, Regatta removed
- Removed imports from various classes no longer used

#story[1003]

visualiser/src/main/java/seng302/Controllers/ArrowController.java

@@ -1,17 +0,0 @@
-package seng302.Controllers;
-
-import javafx.fxml.FXML;
-import javafx.scene.layout.Pane;
-
-import java.net.URL;
-import java.util.ResourceBundle;
-
-/**
- * Created by Joseph on 22/05/2017.
- */
-public class ArrowController extends Controller {
-
-    @Override
-    public void initialize(URL location, ResourceBundle resources) {
-    }
-}

visualiser/src/main/java/seng302/Controllers/RaceController.java

@@ -66,8 +66,6 @@ public class RaceController extends Controller {
      * @param race Race to listen to.
      */
     public void setInfoTable(StreamedRace race) {
-        //boatInfoTable.getItems().clear();
-        ObservableList<Boat> startingBoats = race.getStartingBoats();
         boatInfoTable.setItems(race.getStartingBoats());
         boatTeamColumn.setCellValueFactory(cellData -> cellData.getValue().getName());
         boatSpeedColumn.setCellValueFactory(cellData -> cellData.getValue().getVelocityProp());
@@ -155,7 +153,7 @@ public class RaceController extends Controller {
         initializeFPS();
 
         // set up annotation displays
-        Annotations annotations = new Annotations(annotationPane, raceMap);
+        new Annotations(annotationPane, raceMap);
 
         new Thread((newRace)).start();
     }

visualiser/src/main/java/seng302/VisualiserInput.java

@@ -14,7 +14,6 @@ import java.nio.ByteBuffer;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.ArrayBlockingQueue;
 
 import static seng302.Networking.Utils.ByteConverter.bytesToShort;