Automatically migrate unencrypted databases on request

[ThetaSinner]

This is similar to the change I made here.

I know that Lair databases are meant to be encrypted but the lair_keystore crate exposes the option to disable database encryption by not using default features, so it would be good if there was a way to migrate if you end up being forcibly switched by something that has embedded Lair and changed it's defaults. Looking at you Holochain :)

[ThetaSinner]

Waiting for a new version of sodoken holochain/sodoken#22

[neonphog]

This looks good. It's too bad sqlcipher didn't do a vacuum into integration VACUUM INTO bla AS ENCRYPTED KEY bla.

[ThetaSinner]

That would be more streamlined!

I've got the build for windows working by fetching the libsodium lib from vcpkg instead of the libsodium website. That should be a more reliable source. This only fixes our CI and anybody else building on Windows might run into the same issue but I suspect it's repeated downloads that get blocked rather than individuals. I didn't see this problem locally until I rebuilt a bunch of times

[neonphog]

Nice, I'm happy with this solution. Thanks @ThetaSinner !