Have user confirm that they realy want to self divorce / do something

[GeorgH93]

Some things that would be nice: Doing /marry divorce sends you a confirmation if you're trying to self divorce.

Originally posted by @Qinak in https://github.com/GeorgH93/MarriageMaster/issues/58#issuecomment-498026505

To prevent users from divorcing by accident. It might be worth thinking about implementing a confirmation option for most of the commands while implementing this.