PUND - Prevent Used Node Deletion

This will stop nodes being deleted if they are used through out the site within a Content Picker, Multi Node Tree Picker, Link Picker and Multi Url Picker property types.

A message will be displayed where it is used, so you can remove the instances before deleting the node.

Simple and easy way to stop accidents or errors.

--Update v1.1.0--

- Supports Link Picker

:https://our.umbraco.org/projects/backoffice-extensions/link-picker/

- Supports RJP Multi Url Picker

:https://our.umbraco.org/projects/backoffice-extensions/multi-url-picker/

- Included better error message to display all places the item is used in one message

Not packed into a DLL so you can investigate how the code works with Umbraco Services

File is placed in App_Code/

@MarcCsharp