Adding some forgotten validation projects

cores/validation/validation_PWM/build_as6/test.cppproj

cores/validation/validation_PWM/test.cpp

cores/validation/validation_adc/build_as6/test.atsln

cores/validation/validation_adc/build_as6/test.cppproj

cores/validation/validation_adc/test.cpp

cores/validation/validation_core/build_as6/test.cppproj

...idation/validation_delayMicroseconds/build_as6/test.atsln

...ation/validation_delayMicroseconds/build_as6/test.cppproj

cores/validation/validation_delayMicroseconds/test.cpp

...validation_libarduino_core/build_as6/libarduinocore.atsln

...lidation_libarduino_core/build_as6/libarduinocore.cppproj