session: Improvements to verification
Mainly:
- Differentiate between the device being verified and having the cross-signing keys (and not requiring them).
- Don't send a verification request if we know there are no other devices available.
Closes Consider not requiring the cross-signing keys a... (#1182 - closed).
This is still a draft because required changes in the SDK are not merged yet.
Edited by Kévin Commaille