Add auto-save support and saving indicator

src/app/components/nodes/norm/norm.component.ts

@@ -62,6 +62,7 @@ export class NormComponent extends EditorNodeContract implements OnInit {
         const innerHTML = this.editable.nativeElement.innerHTML;
         if ( this.contents !== innerHTML ) {
             this.contents = innerHTML;
+            this.editorService.triggerSave();
         }
     }