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Первый проход в решении задачи #16 . Начал с того, что обернул всю работу с ошибками и предупреждениями в отдельные методы. Т.о. в дальнейшем в рамках этой же задачи будет проще изменить формат описания ошибок на выходе валидации. Попутно кое-что отрефакторил, подсветил пару вопросов метками TODO, а также предложил варианты для будущих кодов ошибок.
Прошу провести ревью. После него продолжу решение задачи в рамках этого же pull request.