Upgrade to v2

[swithek]

• Rename:
  • Manager.Defaults() -> Manager.reset() (?)
  • Manager.Auth() -> Manager.Authenticate()/Manager.Private() (?)
  • Manager.Init(...) -> Manager.Create(...) Session (?)
  • Manager.Revoke() -> Manager.RevokeCurrent()
  • Manager.RevokeByIDExt() -> Manager.RevokeByID() (the old RevokeByID should be removed)
  • Manager.RevokeOther() -> Manager.RevokeAllOther()
  • DefaultReject() -> DefaultRejectHandler()
  • Reject() -> RejectHandler()
  • Session.UserKey -> Session.SharedKey (?)
• Add Manager.OnRevocation(fn)
• Create a new (optional?) store interface that would store past logins. This would allow the manager to check when the user sends a request from a new machine.
• Use https://github.com/mileusna/useragent for user agent extraction.
• Use the new netip.Addr type.
• Use only RemoteAddr when extracting an IP address. To extract it from other places, the user should use other middlewares (like the one chi has).