Show expiration date in key setup

[lightonflux]

When you launch qtpass for the first time it askes you which keys/users should be able to decrypt it.

The problem is, if you have your old expired keys in your keyring, then it is hard to know which key is still valid (except you know the key id).

So my feature request is that qtpass displays not only Name, email and key id, but also the date the key expires.

[annejan]

I like this idea, will try and incorporate this in the next release..

[annejan]

Not just showing, also filtering them out (unless you check [ ] Show unusable keys).

[lightonflux]

Just compiled and tested. Nice work. 👍