Linked Content Data Type

This package will add a ListLinkedContent Data Type that when added will list content and media items linking to or linked from the current item.

It does not store any actual data and won't have any value in the frontend, but when viewed in backoffice the data type will run this logic and show a summary and detail.

Related items are found by searching relevant data types on the current item for localLinks or node id's. Only properties from the following data types are searched for matches.

•   Rich Text Editor
•   Multinode Treepicker
•   Content Picker
•   Media Picker
•   Legacy Media Picker
•   NestedDataType (from the Nested Data Type package) 

In addition the published content cache is search for the same  data types looking for published items that link to the current item.

Added support for Linked Content inside of Grid proerties.  Also added a seperate package for 7.2 compatibility.