Logic is not closed for modification

[okkhoy]

In the current implementation, logic is calling initializeStorage() method which creates the storage file object. For LO-DIP and later LO-OCP we explain the following:
Using DIP and making StorageFile extend Storage helps OCP as well, because, we can pass any object that is Storage and logic should pick it up.
As long as initializeStorage() is creating the correct type of storage object inside Logic, logic is not closed for modification.
I suggest we move creating the storage object to MainWindow and call Logic::setStorage from there to set the underlying storage.