FR: Central SSH-Key store

First I like to thank the team for the excellent tool and support. Well done.

When using the Terminal from the host list, the ssh private key must be added to each single host. It would be beneficial and better from a security point of view to have a central place to store all ssh-keys and just select the one to use in the host.

To be honest, originally we didn't implement the ability to store ssh keys but I actually don't see the issue with it so long as it's encrypted at rest in the db and secure.

I'll keep this in mind and circle back here once I've thought about it a bit deeper.