pkgsrc: also bump bl3 for libcbor solib version change.
hid_linux: return FIDO_OK if no devices are found.
hid_osx:
repair communication with U2F tokens, gh#166; reliability fixes.
fido2-{assert,cred}: new options to explicitly toggle UP, UV.
Support for configurable report lengths.
New API calls:
fido_cbor_info_maxcredcntlst;
fido_cbor_info_maxcredidlen;
fido_cred_aaguid_len;
fido_cred_aaguid_ptr;
fido_dev_get_touch_begin;
fido_dev_get_touch_status.
Use COSE_ECDH_ES256 with CTAP_CBOR_CLIENT_PIN; gh#154.
Allow CTAP messages up to 2048 bytes; gh#171.
Ensure we only list USB devices by default.
