Core: change type of Init method parameter to int
CMakeLists: fix build - link raspboop libraries and find wiringPi
Sensor: dtor empty implementation
GPIOConsumer: dtor empty implementation
HCSR04: remove Trigger() member
HCSR04: Sense() implementation
HCSR04: ReleasePins implementation
HCSR04: fix Sense() digitalRead
HCSR04: change TRIG to TriggerPin