Integrate a JSON editor for databags

[barryrowlingson]

lektor's through-the-web editing of content is great, but wouldn't it be great to be able to edit databags through-the-web also? Using something like:

https://github.com/josdejong/jsoneditor/

then users could edit JSON data in a structured way....

Its probably a lot of work for what might be a niche feature, so feel free to delete if this is too much. I don't have the time or JS skills to implement it. Or leave it as a feature request/enhancement and see if anyone picks it up?

Tx

[nixjdm]

Ref #458

[goanpeca]

@barryrowlingson I think that the admin editor is a key feature for editor, so it could be also a nice addition. However I believe the component needs to work with react as the admin is built with it?