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/model/RaceConnection.java

@@ -3,10 +3,6 @@ package visualiser.model;
 import javafx.beans.property.SimpleStringProperty;
 import javafx.beans.property.StringProperty;
 
-import java.io.IOException;
-import java.net.InetSocketAddress;
-import java.net.Socket;
-
 /**
  * Connection for Races
  */