User can save, reset or cancel.

- Created a notification popups for errors
- Added functionality to save, cancel and reset buttons
- Key bindings are only saved if they're valid
- Added window close event
- Can not exit without saving correctly
- CSS to cancel, save and reset buttons to differentiate between key buttons
- Javadocd

#story[1197]

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

@@ -0,0 +1,35 @@
+package visualiser.Controllers;
+
+import javafx.fxml.FXML;
+import javafx.scene.control.Label;
+import javafx.scene.paint.Color;
+import javafx.scene.text.Text;
+import javafx.stage.Stage;
+
+/**
+ * Controller for a popup notification regarding user activity.
+ */
+public class NotificationController {
+    private @FXML Label lblDescription;
+    private @FXML Text txtMessage;
+
+    /**
+     * Closes the popup window once clicked.
+     */
+    public void ok(){
+        ((Stage)lblDescription.getScene().getWindow()).close();
+    }
+
+    /**
+     * Displays the appropriate popup notification.
+     * @param message message for the user
+     * @param warning if true warning text shown, if false success text shown
+     */
+    public void setMessage(String message, Boolean warning){
+        lblDescription.setText(message);
+        if (!warning){
+            txtMessage.setText("Success!");
+            txtMessage.setFill(Color.GREEN);
+        }
+    }
+}