====== Base64 ======

  *[[https://github.com/adamvr/arduino-base64]]
  *[[https://github.com/boseji/rBASE64]]
  *[[https://www.arduinolibraries.info/libraries/base64]]
  *[[https://techtutorialsx.com/2017/12/09/esp32-arduino-base64-enconding/]]
  *[[https://techtutorialsx.com/2018/11/27/esp32-arduino-base64-decoding/]]
  *[[https://forum.arduino.cc/index.php?topic=448942.0]]