PN532 NFC library

Fork of Seed-Studio's PN532 library with some small additions

If you are looking for an ESP-IDF component, check out the esp-idf branch as that was reworked with the SPI Master Driver APIs

Added setRFConfiguration method
Modified readPassiveTargetID's signature to optionally return atqa and sak
Added timeout arg to inCommunicateThru
Implemented Extended Frame