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This PR adds a simple interface for storing/retrieving settings from database. Settings provide additional abstractor over the plain
db.Instance
.Settings are only saved when
settings.Persist()
is called. A corresponding shutdown hook is registered during setup.store.Provider
andstore.Store
provide abstraction for creating a store for a single value and load/save against that store. Using these, individual devices do not need to depend on the settings implementation. See #4838 for example usage.