Request: Add a delete button to the item window

[ghost]

This is a feature request.

I am using the Data Manager in conjunction with contact and other submission forms. So, any time a form is submitted, the contents are saved to the user>data folder as well as being emailed. This is handy as a reference in case the form is not received or lost, and also as a permanent record of a response eg agreeing to terms and conditions.

It is all working well with Grav 1.7.26. However, I thought it would be nice to have a way to delete items that you don't want. The main use case would be removing spam messages that are sent thought the email contact form.