Support for CLASS (i.e. public/private/confidental)

[vonshednob]

In a shared calendar environment the CLASS property is rather useful to hide sensitive details in events from others (e.g. passwords for online meetings in the description of the event; but the event itself should be visible in the shared calendar to indicate that you are not available).
Currently it’s not possible in khal to set that property.

[Danaelmilo]

Hello,
With a friend of mine, we are currently working on this issue. We want to modify the new_vevent function from khal/khal/icalendar.py file, to add a 'class' attribute to the icalendar.Event. Do you think it is a good solution ?
Please tell us if you have any other advice or remark.