added gps support

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

sensors/android/GPSSensorAndroid.h

@@ -0,0 +1,74 @@
+#ifndef GPSSENSORANDROID_H
+#define GPSSENSORANDROID_H
+
+#ifdef ANDROID
+
+#include <sstream>
+
+#include "../GPSSensor.h"
+
+#include <QtPositioning>
+
+class GPSSensorAndroid : public GPSSensor {
+
+private:
+
+	QGeoPositionInfoSource* source;
+
+	/** hidden ctor. use singleton */
+	GPSSensorAndroid() {
+
+		source = QGeoPositionInfoSource::createDefaultSource(nullptr);
+		return;
+
+	}
+
+	bool started = false;
+
+public:
+
+	/** singleton access */
+	static GPSSensorAndroid& get() {
+		static GPSSensorAndroid gps;
+		return gps;
+	}
+
+	void start() override {
+
+		if (started) {return;}
+		started = true;
+
+		auto onPositionData = [&] (const QGeoPositionInfo& update) {
+
+			GPSData data(
+				//Timestamp::ms(update.timestamp().toMSecsSinceEpoch()),
+				Timestamp::fromRunningTime(),
+				update.coordinate().latitude(),
+				update.coordinate().longitude(),
+				update.coordinate().altitude()
+			);
+
+			informListeners(data);
+
+		};
+
+		if (source) {
+			source->connect(source, &QGeoPositionInfoSource::positionUpdated, onPositionData);
+			source->startUpdates();
+		}
+
+	}
+
+	bool isRunning() const override {
+		return started;
+	}
+
+	void stop() override {
+		throw "TODO";
+	}
+
+};
+
+#endif // ANDROID
+
+#endif // GPSSENSORANDROID_H