- added download personal data feature

src/ClientServer/Config/Constants.cs

...Server/Controllers/Core/Exercises/SubmissionController.cs

src/ClientServer/Controllers/Core/Init.cs

...lientServer/Controllers/Core/Testing/TestingController.cs

src/ClientServer/Controllers/Core/Users/PrivacyController.cs

...entServer/Controllers/Core/Users/SystemRolesController.cs

src/ClientServer/Controllers/Core/Users/UsersController.cs

src/ClientServer/Helpers/Files.cs

...4_SystemRolePermissionCanDownloadPersonalData.Designer.cs

...0914132004_SystemRolePermissionCanDownloadPersonalData.cs

src/ClientServer/Migrations/YapexDbContextModelSnapshot.cs

...stomProjects/CustomProjectTestWithSolutionAsTestResult.cs

...ntServer/Models/Exercises/AfterSolutions/AfterSolution.cs

...AfterSolutions/CustomTestWithAfterSolutionAsTestResult.cs

...cises/AfterSolutions/TestWithAfterSolutionAsTestResult.cs

...ises/Solution/CustomTestWithSingleSolutionAsTestResult.cs

...rcises/Solution/ExerciseReleaseWithUserAsParticipation.cs

src/ClientServer/Models/Exercises/Solution/Solution.cs

.../Exercises/Solution/TestWithSingleSolutionAsTestResult.cs

src/ClientServer/Models/Exercises/Tests/Test.cs