scd: PC/SC pinpad input improvement.

* scd/apdu.c (struct reader_table_s): Add members: PINMIN, PINMAX, and
PINPAD_VERLEN_SUPPORTED.
(CM_IOCTL_VENDOR_IFD_EXCHANGE, FEATURE_GET_TLV_PROPERTIES,
PCSCv2_PART10_PROPERTY_*): New.
(new_reader_slot): Initialize pinpad_varlen_supported, pinmin, pinmax.
(pcsc_vendor_specific_init): New.
(open_pcsc_reader_direct, open_pcsc_reader_wrapped): Call
pcsc_vendor_specific_init.
(check_pcsc_pinpad): Not detect here but use the result of
pcsc_vendor_specific_init.
(pcsc_pinpad_verify, pcsc_pinpad_modify): Specify bNumberMessage.

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Signed-off-by: NIIBE Yutaka

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