Possibility to choose addressbook(s) for birthdays

[omocinteractive]

Is your feature request related to a problem? Please describe.

I don't want to see every birthday from e.q. ex girlfriends and other archived contacts. But often, it's important, to have the adress (in a different addressbook).

Describe the solution you'd like

It would be nice, to choose the addressbook(s) for birthdays or to disable addressbook for the generated birthday calendar.

Describe alternatives you've considered

No response

Additional context

No response

[newhinton]

Another way of enabling this functionality would be to use the three-dot menu. (The one that allows you to omit the year)
We could implement a "dont show in calendar"-checkbox, which then would omit the contact from the auto creation of the birthay calendar.

It should be possible to use a custom vcard attribute for that.

[omocinteractive]

@newhinton: Sounds like a passable solution!