Drag n drop sorting for custom fields (#906)

* Try to fix some security vulnerabilities present in used packages

(Ran npm audit fix, solved some of the issues)

* Implement custom field ordering with new handle placement

(WIP, as an update for the jslib is needed to work correctly)

* Update reference for jslib

* Restore original state of package-lock.json

* Downgrade node sass package

src/popup/app.module.ts

@@ -1,6 +1,7 @@
 import 'core-js';
 import 'zone.js/dist/zone';
 
+import { DragDropModule } from '@angular/cdk/drag-drop';
 import { ToasterModule } from 'angular2-toaster';
 import { Angulartics2Module } from 'angulartics2';
 import { Angulartics2GoogleAnalytics } from 'angulartics2/ga';
@@ -149,6 +150,7 @@ registerLocaleData(localeZhTw, 'zh-TW');
         }),
         ToasterModule.forRoot(),
         InfiniteScrollModule,
+        DragDropModule,
     ],
     declarations: [
         ActionButtonsComponent,