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Add `bitToggle` macro to complement `bitSet` etc

Port of https://github.com/arduino/ArduinoCore-avr/commit/0c5aa78ff40d208a1341b3dae84166e837901070
Reference PR: https://github.com/arduino/ArduinoCore-avr/pull/31
S
Shriramana Sharma committed
3daf1893582d3a1cc6f5b56f7e6949009052a05a
Parent: 6dec2cb
Committed by Martino Facchin <m.facchin@arduino.cc> on 4/10/2020, 9:41:21 AM