Vue Comments: Comments ported to Vue + DnD fileupload

* Drag and drop files to comment editor to add a file attachment
* Using Vue to render comments

Since comments now has attachments we need to update the schemas
./manage.py maintenance replace_pillar_node_type_schemas

src/scripts/tutti/10_tasks.js

@@ -122,7 +122,7 @@ function asset_open(asset_id)
 window.onpopstate = function(event)
 {
     var state = event.state;
-
+    if(!state) return;
     item_open(state.itemId, state.itemType, false);
 }