Merge Part 5 (PR#2557)

Marlin/MarlinSerial.cpp

Marlin/MarlinSerial.h

Marlin/Sd2Card.cpp

Marlin/Sd2Card.h

Marlin/Sd2PinMap.h

Marlin/SdBaseFile.cpp

Marlin/SdBaseFile.h

Marlin/SdFatConfig.h

Marlin/SdFatStructs.h

Marlin/SdFatUtil.cpp

Marlin/SdFatUtil.h

Marlin/SdFile.cpp

Marlin/SdFile.h

Marlin/SdInfo.h

Marlin/SdVolume.cpp

Marlin/SdVolume.h

Marlin/blinkm.cpp

Marlin/buzzer.cpp

Marlin/cardreader.cpp

Marlin/cardreader.h