Save SHA1(UPPER(user):UPPER(pass)) hash to login.cfg instead of the
plaintext password. On subsequent logins, use the stored hash directly
with a new authenticateWithHash() method that bypasses password hashing.
The password field shows a placeholder when using a stored hash.
Account for PIN/matrix/authenticator extra data in packet size
calculation to prevent receive buffer corruption. Add hex dump
of raw auth packets and show actual server error codes.
