* totp : rework and add SHA256/512
* totp : comment code
* totp : fix SHA224/SHA384 and examples
* totp : fix bug in totp_face_lfs
* totp : init_totp_record to SHA1
* totp : move TOTP-MCU to TOTP, update README and example
* totp : SHAX, use size_t n instead of harcoded 8
* clarify what to put in TOTP face
Co-authored-by: Emilien <Emilien>
Co-authored-by: joeycastillo <joeycastillo@utexas.edu>
