Many thanks to Kerigan for providing the original C code.
This commit mainly posts his code to zig.
Additional features provided by me are:
	- automatically checking every 100ms
	- request new login info for new usernames

Co-authored-by: Kerigan <kerigancreighton@gmail.com>

This also involves a major split of the authentication code, which allows
the fingerprint and password logins to use the same code.