ArduinoFake with cpputest

Minimal example demonstrating CppuTest using ArduinoFake & CMake:

to run:

• mkdir test/build && cd test/build
• cmake ..
• cmake --build .
• ./first_test

if you need to rebuild the blink object, you can run g++ -c src/blink.cpp -o test/objs/blink.o -D UNIT_TEST -I test/build/_deps/arduinofake-src/src/

The example currently fails with 'fakeit::UnexpectedMethodCallException' because it is apparently trying to call loop() from fakeit rather than src/blink.cpp