[Request] Session management

[zrax]

Currently, all fields in the connect dialog are stored independently, with their own history. It would be convenient when connecting frequently to multiple hosts via different SSH tunnels to have a concept of a Session, which would group the saved server, settings, and SSH tunnel parameters together for easier recall.

I would envision the feature to be listed above the current fields. When left blank, the rest of the dialog would behave as it does today. When filled in with an existing session name, the rest of the dialog would be pre-populated (but still editable) with the previous settings for that session. Any time the entry is non-blank, the current settings will be saved to the named session upon successful connection (in addition to the current settings saving done today)