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Here's the key types and our thoughts about them:

App

Currently the AppFrameView is created and managed by the AppContext. We are using abstract classes where not really necessary. So we end up creating App classes extending AbstractApp, only because the class is abstract.

-> Use concrete implementations for AbstractApp, AbstractContentApp, AbstractItemApp. This will allow us to get rid of most classes implementing those classes. We can inject the AppContext and App(Frame)View directly into the AbstractApp instead of passing it from the AppClass.

we can simplify the AppContext and remove the dependency on AppFrameViewSeams to be fine.

AppController

The AppController is in general in a good shape. Interface is well defined and usages are legit.

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