Refactor

src/Command/SendMarksToUsersCommand.php

src/Controller/GroupController.php

src/Controller/LessonController.php

src/Controller/UserController.php

src/Entity/Group.php

src/Message/SendMarksMailMessage.php

src/Services/AvatarService.php

src/Services/LessonService.php

src/Services/PaginatorDecoratedService.php

src/Services/UserService.php