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/resources/visualiser/scenes/main.fxml

@@ -1,9 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<?import java.lang.*?>
-<?import javafx.scene.layout.*?>
 <?import javafx.scene.layout.AnchorPane?>
-
 <AnchorPane fx:id="main" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="visualiser.Controllers.MainController">
     <children>
         <fx:include fx:id="race" source="race.fxml" />