Remember user's inline/tabular diff view preference in a cookie
As per #3071 (closed), some users (we have a local EE installation) prefer 2-column view in diff. In this MR I add an implementation for this feature, using a cookie.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
As per #3071 (closed), some users (we have a local EE installation) prefer 2-column view in diff. In this MR I add an implementation for this feature, using a cookie.