Add SIGUSR1 and SIGUSR2 signals to disable/enable the LEDs

Fixed enable on LedDeviceWrapper constructor.

libsrc/hyperion/LinearColorSmoothing.cpp

@@ -98,6 +98,8 @@ int LinearColorSmoothing::switchOff()
 		_outputQueue.pop_front();
 	}
 
+	emit _hyperion->ledDeviceData(std::vector<ColorRgb>(_ledCount, ColorRgb::BLACK));
+
 	return 0;
 }
 

libsrc/leddevice/LedDeviceWrapper.cpp

@@ -20,6 +20,7 @@ LedDeviceWrapper::LedDeviceWrapper(Hyperion* hyperion)
 	: QObject(hyperion)
 	, _hyperion(hyperion)
 	, _ledDevice(nullptr)
+	, _enabled(true)
 {
 	// prepare the device constrcutor map
 	#define REGISTER(className) LedDeviceWrapper::addToDeviceMap(QString(#className).toLower(), LedDevice##className::construct);