Enhancement: Hide certain lessons from Timetable

[mosstuff]

Problem Statement

Since Teachers aren't the most tech savvy people on this planet, some at my school add me to lessons I don't actually have whilst other don't add me to their lessons so I can only see them from the class timetable which is also filled with more unrelated lessons.

Solution Ideas

A option to hide/blacklist certain lessons from the personal timetable / add other lessons from the class timetable to the personal one