Started to implement logging functionality
Added TxtLogger with infrastructure tests
Added operation change event to log, hiding ViewModel members
Logging updated input from user
Log is not updated when input is the same
Resolved deprecation warning
Added tesCompile dependency
Fixed unchecked warnings
Added ViewModel tests with TxtLogger
Updates log names
Removed commented test
Merge pull request #97 from kirill-kornyakov/lab3

Kornyakov -- Lab3