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Hi,
I've re-factored most code with help of flake8. There was a lot of unused modules and too long lines. I've also changed naming convention of UI classes and made it consistent among all modules. @kuba-orlik, @jaroslaw-wieczorek: please review latest commits on branch refactor.
@jaroslaw-wieczorek I've noticed that you're using some code auto-generating tool like IDE. I generates a lot of redundant or poorly formatted code. Please try to avoid auto-generating code where it's not required.
I will try to inspect code from business logic perspective later, if time allows.