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Co-authored-by: Confiks <confiks@scriptbase.org>

- Sessions now start with a SessionRequest instead of the requestor's JWT
- Move protocol version negotiation to later in the protocol to decouple QR contents from SessionRequest
- Fix legacy in protocol
- Support for multiple keyshare servers in issuance sessions
Co-authored-by: Confiks <confiks@scriptbase.org>

Instead we just branch in some functions over whether or not the session is interactive. This solves some code duplication; gives manual sessions the ability to download unknown scheme manager files on the fly, like interactive sessions; and it solves manual sessions missing some calls back to the Handler.

This prevents the 'use of internal package not allowed' go compile error

The struct name now matches exactly (up to idiomatic spelling differences)
with the name of the folder that it parses and updates.