added gps support

added compass support
added ui elements for gps and compass
added support for writing sensor data

sensors/dummy/CompassSensorDummy.h

@@ -0,0 +1,43 @@
+#ifndef COMPASSSENSORDUMMY_H
+#define COMPASSSENSORDUMMY_H
+
+#include "../CompassSensor.h"
+#include "RandomSensor.h"
+#include <random>
+
+class CompassSensorDummy : public RandomSensor<CompassData, CompassSensor> {
+
+private:
+
+	std::thread thread;
+
+	/** hidden ctor */
+	CompassSensorDummy() : RandomSensor(Timestamp::fromMS(100)) {
+		;
+	}
+
+public:
+
+	/** singleton access */
+	static CompassSensorDummy& get() {
+		static CompassSensorDummy compass;
+		return compass;
+	}
+
+protected:
+
+	std::minstd_rand gen;
+	std::uniform_real_distribution<float> distNoise = std::uniform_real_distribution<float>(-0.07, +0.07);
+
+	CompassData getRandomEntry() override {
+
+		const Timestamp ts = Timestamp::fromRunningTime();
+
+		const float azimuth = 0 + std::sin(ts.sec()) * 0.5 + distNoise(gen);
+		return CompassData(azimuth);
+
+	}
+
+};
+
+#endif // COMPASSSENSORDUMMY_H