- added limit for letsencrypt and directive snippets selector to client limits
- hide ssl tab if letsencrypt is selected

Next step is to implement some DNSSEC-Requiring Record Types uon request of some others (will be within this branch before removing the WIP state)

And found a small bug (privkeys were not deleted on zone deletion) which is now fixed
Testing successful. Doing last test then if everything goes well this will be the new merge request

final commit? Will test now a last time and if everything works as expected this will be my merge request