Add nk3-change-pin command

[sosthene-nitrokey]

This PR add the command hotp-verification nk3-change-pin <old-pin> <new-pin> to change the PIN of a NK3.
It only works for NK3.

[nestire]

for a connected nk pro, nk storage i get this

[user@work nitrokey-hotp-verification (nk3-change-pin)]$ ./hotp_verification nk3-change-pin 123456 111222
HOTP code verification application, version 1.6

Segmentation fault (core dumped)
[user@work nitrokey-hotp-verification (nk3-change-pin)]$