Bugfix/51 selectionmodel fix (#60)

* bugfix for #51. ManagebusManagementThread now never accesses or changes the JAVAFX view-backing ObservableList but using a concurrenthasmap which drives the Tableview backing list with snapshots

* Extending work at #51 for not adding users on UM3 message

* Add interactive aircraft scatter hero effect

website/src/_layouts/base.njk

@@ -81,5 +81,10 @@
       </div>
     </div>
   </footer>
+
+  {% if heroFx %}
+    <script src="/assets/js/hero-radio-fx.js?v={{ build.version }}" defer></script>
+  {% endif %}
+
 </body>
 </html>