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 Implements ADC and DAC functions, Interrupt and Wifi Shield validation

Paths from command line in Windows style ("C:\path\etc...") should be
enclosed in double brackets like "{{C:\path\etc...}}" to avoid OpenOCD's
tcl interpreter to escape them.

 board file updates 

Conflicts:
	hardware/arduino/samd/variants/arduino_zero/variant.cpp

Conflicts:
	hardware/arduino/samd/variants/arduino_zero/variant.cpp

Conflicts:
	hardware/arduino/samd/variants/arduino_zero/variant.cpp

Conflicts:
	hardware/arduino/samd/cores/arduino/SERCOM.cpp
	hardware/arduino/samd/cores/arduino/SERCOM.h

Conflicts:
	hardware/arduino/samd/variants/arduino_zero/variant.cpp