Implemented marker visualisation from XML in ResizableRaceCanvas

- Replaced and deprecated Constants
- Added getMarkers to RaceDataSource interface
- Added boundary testing for source data

#story[782]

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

@@ -125,7 +125,6 @@ public class RaceController extends Controller {
         raceMap.widthProperty().bind(canvasBase.widthProperty());
         raceMap.heightProperty().bind(canvasBase.heightProperty());
         //raceMap.setBoats(newRace.getStartingBoats());
-        raceMap.setRaceBoundaries(raceData.getBoundary());
         raceMap.drawRaceMap();
         raceMap.setVisible(true);