Add config option for adding a designated revoker for all new keys
Turns out we don't need anything in GpgME for this at all 😄
Do we need the ability to set more than one designated revoker?
(cherry picked from commit 9e94c307c233783bb1efd33e6a7fb3853a86091f)
- GnuPG-Bug-ID: T6881