Rewriting code to work with the transplanted loop

- Event has been replaced by leg, which holds the start and end coordinates, and total distance needed to pass it.
- The boats coordinates will be recalculated at each run through of the loop
- Not worrying about randomised race for now.

#refactor

src/main/resources/scenes/mainpane.fxml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<?import java.lang.*?>
+
 <?import javafx.scene.layout.*?>