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/templates/nodes/custom/asset/view_theatre_embed.pug

@@ -42,7 +42,9 @@
 			a(href="{{ node.short_link }}") {{ node.short_link }}
 		| {% endif %}
 
-	#comments-embed
+	comments-tree#comments-embed(
+		parent-id="{{ node._id }}"
+	)
 
 include ../_scripts