Activation policies that control how the app is activated.
This type can have following values:
App::ActivationPolicy::Regular- The application is an ordinary app that appears in the Dock and may have a user interface.
App::ActivationPolicy::Accessory- The application does not appear in the Dock and does not have a menu bar, but it may be activated programmatically or by clicking on one of its windows.
App::ActivationPolicy::Prohibited- The application does not appear in the Dock and may not create windows or be activated.