SCD: handle keypad request on the card.
* scd/app-openpgp.c: Add 2013. (struct app_local_s): Add keypad structure. (parse_login_data): Add parsing keypad request on the card. (check_keypad_request): New. (verify_a_chv, verify_chv3, do_change_pin): Call check_keypad_request to determine use of keypad.