Deprecation for legacy formatters on 2.99
Created by: JonRowe
Backports the FormatterLoader so we can issue deprecations for the legacy interface on 2.99, should also solve #1476 (closed) (same formatter logic as 3.x)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: JonRowe
Backports the FormatterLoader so we can issue deprecations for the legacy interface on 2.99, should also solve #1476 (closed) (same formatter logic as 3.x)