Convert a base64 code (a string of printable characters according to RFC 2045) into the original ASCII data set of range 0-255. If option as_string is passed, the return value is converted into a string. Otherwise, the return value is a uint8 row vector.
base64decode ('SGFrdW5hIE1hdGF0YQ==', true)
⇒ Hakuna Matata
See: http://www.ietf.org/rfc/rfc2045.txt
Package: strings