## outboxMutationProcessed

Dispatched when a local change has finished synchronization with the Cloud and is updated locally

HubPayload `outboxMutationEvent` contains:
- `modelName` (String): the name of the model that has finished processing
- `element`: 
    - `model` (Model): the model instance that is processed
    - `_version` (Int): version of the model instance
    - `_lastChangedAt` (Int): last change time of model instance (unix time)
    - `_deleted` (Bool): true if the model instance has been deleted in Cloud