When a new key is bound other commands bound to this key are removed

- On binding new key existing keys are searched
- If key is in use the old one is removed
- ControlKey is updated with a placeholder key value

#story[1197]

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

@@ -114,7 +114,15 @@ public class KeyBindingsController {
         anchor.addEventFilter(KeyEvent.KEY_PRESSED, event -> {
             // if a button was clicked
             if (currentButton != null) {
-                System.out.println("button is clicked");
+                // check if a button is already mapped to this key
+                for (int i = 1; i < lstKey.getItems().size(); i++) {
+                    Button button = (Button)lstKey.getItems().get(i);
+                    // update buttons text and remove key binding from command
+                    if (button.getText() == event.getCode().toString()) {
+                        button.setText("");
+                        newKeyFactory.updateKey(button.getId(), button.getId());
+                    }
+                }
                 // update text on the button
                 currentButton.setText(event.getCode().toString());
                 // update the control key