SecureApp remove network objects from app is missing

[marioland]

We miss the function to delete/remove a network object from a app.

A simple implementation could delete a unused network object in SecureApp.

A more advanced implementaion would resolve all dependencies first and then delete the network object itself. Dependecies are e.g. object is in a connection, interface connection, group or used in another app. Like in the Server Decommissioning. But Server Decommissioning we cannot find either.