Рябенко - Лабораторная работа №2

@VVillwin, @borodulina, @ljaljushkin review please.
Probably, you can do something like this:
(in SquareMatrixClass.java)  `ActionListener onButtonClick = new ActionListener(){...}`,
(and at this line) `binding="buttonCalculate" onAction="onButtonClick"`.
I'm not sure about the exact code, but could you please try it (it should be like in javafx version)? *It's just a wish, not a requirement =)*