Sails are displayed on first boat in a race. Optimised imports.

- Implemented drawSails method
- Sail position is displayed and updated using a boat's heading
- Sails conform to 'Points of sail'
- Javadoc'd new method and tidied up existing
- Sped up track point frequency (visualiserBoat class)
- Optimised imports (any other classes changed)
- A lot of canvas drawing and sail rotating issues were discovered and eventually overcome along the way. Using a sail image to draw and rotate on the existing canvas rather than a JavaFX shape on a new canvas was the final decision.

#story[1098]

racevisionGame/src/main/java/visualiser/Controllers/HostController.java

@@ -1,21 +1,17 @@
 package visualiser.Controllers;
 
-import javafx.application.Application;
 import javafx.fxml.FXML;
-import javafx.scene.control.*;
+import javafx.scene.control.TextField;
 import javafx.scene.layout.AnchorPane;
-import javafx.stage.Stage;
 import mock.app.Event;
 import shared.exceptions.InvalidBoatDataException;
 import shared.exceptions.InvalidRaceDataException;
 import shared.exceptions.InvalidRegattaDataException;
 import shared.exceptions.XMLReaderException;
-import visualiser.model.RaceConnection;
 
 import java.io.IOException;
 import java.net.Socket;
 import java.net.URL;
-import java.net.UnknownHostException;
 import java.util.ResourceBundle;
 
 /**