src: make BaseObject::is_snapshotable virtual
Use a virtual function in order to save space (8 bytes per instance on 64-bit platforms) and in order to be consistent with the other methods on BaseObject.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Use a virtual function in order to save space (8 bytes per instance on 64-bit platforms) and in order to be consistent with the other methods on BaseObject.