fixes #3115 and adds support for gif bmp & tiff images
Created by: bbodenmiller
when showing image preview check via lowercased extension and adds support for gif bmp & tiff images
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: bbodenmiller
when showing image preview check via lowercased extension and adds support for gif bmp & tiff images