Depending on the user, DaVinci creates really strange things. Remove duplicate entry (or most of them).

Released 4.19 with introduction of Qt 5 SystemTrayIcon as well as taking care of DaVincis Absent Classes Reasons.

Removed old not supported file types. Moved parser to separate modules and implemented five different types: 1 Normal Standin, 2 Cancelled classes, 3 Additional information manually populated through CSV, 4 Yard Duty, 5 Teacher out of school.

New release 4.14: optimized the procedure in order to determine the correct lesson. Improved error messages.