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/gameController/Keys/KeyFactory.java

@@ -39,6 +39,10 @@ public class KeyFactory {
         return keyState;
     }
 
+    public void setKeyState(Map<String, ControlKey> keyState) {
+        this.keyState = keyState;
+    }
+
     /**
      * Update the key bound to a particular command in the keystate.
      * @param newKey the new key value for the command