lib: refactor to use private field and method in watchdog
_started -> #started _effective -> #effective _onNewListener -> #onNewListener _onRemoveListener -> #onRemoveListener
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
_started -> #started _effective -> #effective _onNewListener -> #onNewListener _onRemoveListener -> #onRemoveListener