Use Name List Macro for File

Currently the reference to a file on the asset, event, and todo template is a simple link.

We need to replace the link with a Name List Macro so that users are supported to find the todo (where the file points to) with the new autocomplete feature.

In case the link does not point to a file document, it is easier for the user to replace the macro with a link than to add the Name List Macro.