Improve markup detection, fixes #4695
Created by: Razer6
If file extension isn't given in lower case markup fails. Avoid this by downcasing before comparing with supported extensions.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: Razer6
If file extension isn't given in lower case markup fails. Avoid this by downcasing before comparing with supported extensions.