Error handling in GUI

Added an decorator for the class so that all exceptions thrown in the GUI will be caught and a stacktrace displayed. This also should prevent the GUI from totally crashing so that the user has time to save their stuff. Closes #83 (closed)

changed milestone to %Period 2 Kanban

added Feature development + 1 deleted label

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@adaja901 Please look at this when you have time! :)

In improved_main_window.py on row 46 in the construktor you assign self._window = self , why? I think it's unecessary cause you can just use self or is it for a reason you do that? @jacwa448

It is to make sure this line works for all classes. QErrorMessage(self._window).showMessage(f"Unexpected error: {format_exc()}")

Okej nice!

Why do you assign self_window to itself?

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mentioned in commit 08eaa299

merged