@mention to reference contacts and groups in a comment

There are times when it is useful to be able to reference a contact or group when writing a comment. So that the user doesn't have to explain who they are referencing, they could more simply use an @mention type of function to have the record create a hyperlink to the other record.

Currently @mention only shows users of the DT instance. One way this functionality might be able to be achieved is to use the style of tagging that uses the hastag. eg.

Use one hash after the (at) like @#contact for a contact and a double hash for a group @##group