Handle app removal and adding only in appsystem #555
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Instead of an app emitting removed and then the appsystem removing it, the app system connects to the app property notifies and then removes it. This now also allows to get apps from the appsystem without adding them to the dock. This will be useful in the future (e.g. appmenu/smart suggestions) to make sure only a single app object exists for an app with a given id. The appsystem will then act kind of like an repository and it connects to the signals and adds them to the dock once they should be in the dock (pinned or has windows).
Includes #553