Added updated arduino.h in new clean branch
Added PIO mappings in arduino.h
Renamed copypasted ifdefs in arduino.h for consistency
Included pio.h that already has port defines
Defines changes for DACC, ADC

Made changes to the defines for DACC, ADC pin mappings so they make use
of adc.h and dacc.h and their respecpective tests
Merge remote-tracking branch 'origin/integration' into arduino_pin_mapping
Added missing LED-pin and some comments
Merge remote-tracking branch 'origin/integration' into arduino_pin_mapping
Merge remote-tracking branch 'origin/integration' into arduino_pin_mapping
Organised pin mapping for PIO in arduino.h
Fixed typos in docs