Added a race importer. Added imported races to visualizer. Made it so that the host sets the race. Refactored server to no longer be dependant on a specific race. Tested functionality of map manually. Some bugs found and listed below.

#implement #testmanual #story[1275]

Known bugs:
 * Can't move
 * Map is off center in lobby view.
 * 3D Map is off center

src/main/java/seng302/visualiser/controllers/LobbyController.java

@@ -153,7 +153,7 @@ public class LobbyController implements Initializable {
      * Initializes a top down preview of the race course map.
      */
     private void initMapPreview() {
-        gameView = new GameView();
+        gameView = new GameView(new ArrayList<>(), new ArrayList<>(), new ArrayList<>());
         gameView.setHorizontalBuffer(330d);
 
         mapWidth = 770d;