feat: baud enum

src/libLoad/TTILD400P.cpp

src/libLoad/TTILD400P.h

src/libMeter/Fluke8842.cpp

src/libMeter/Fluke8842.h

src/libMeter/HP3478A.cpp

src/libMeter/HP3478A.h

src/libMeter/Keithley2000.cpp

src/libMeter/Keithley2000.h

src/libScope/Tektronix654C.cpp

src/libScope/Tektronix654C.h

src/tools/arduino_eeprom.cpp