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/resources/css/keyBindings.css

@@ -23,6 +23,7 @@
     -fx-text-fill: #242d35;
     -fx-font-size: 12px;
     -fx-font-family: "Courier New";
+    -fx-border-color: #a9c8ff;
 }
 
 .button:focused {
@@ -32,4 +33,13 @@
 
 #anchor {
     -fx-background-color: #fdfac3;
+}
+#menu{
+    -fx-background-color: linear-gradient(#acdeff 50%, #a9c8ff 100%);
+    -fx-background-radius: 4px;
+    -fx-border-radius: 4px;
+    -fx-text-fill: #242d35;
+    -fx-font-size: 12px;
+    -fx-font-family: "Verdana";
+    -fx-border-color: #a9c8ff;
 }