Add the edit button

[BertrandBordage]

First, thanks for this project, it’s really a must-have that should be in wagtail.contrib.modeladmin!

It would be perfect if we could have the edit button like other *ChooserPanels.
I know this is more tricky since there’s no view for editing this kind of model. But it could be specified either using a get_edit_url model method or with a function passed to the ChooserPanel, like lambda instance: '[app]_[model]_modeladmin_edit', instance.pk. By default, we could try to use the default ModelAdmin url I specified in the lambda, and if doesn’t work, hide the button.

[leo-naeka]

Hi Bertrand!

Thank you for your kind comment about this module.
I haven't made much noise about this because all this panel stuff seems to be replaced by react components in a foreseeable future, and I hope this will be way more flexible.
You can follow discussions about that here and here.

I do not have time to look at your request right now, but will look asap. Feel free to submit a PR to speed-up the process.