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Julian Sparber authored
The manager is a central place for handling data e.g. calls history and provider managment. This introduces only the base for feature work. Therefore it manages only the provider for now, but the manager isn't yet used anywhere. The propagets events from the provider and origins. It also adds a new signal called `error`. The `error` signal should be emited only when something went wrong and we need to inform the user about it, containing the message to be displayed to the user. Windows should connect to the event and display a in-app-notification on error. This event isn't emitted, because the plugins don't give us a usable error.