GPS implementation (#216)

Implemented basic GPS support:
- GPS HAL
- GPS Service
- GPS Settings app

TactilityHeadless/Include/Tactility/service/gps/Gps.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "Tactility/hal/gps/GpsDevice.h"
+
+namespace tt::service::gps {
+
+/** Register a hardware device to the GPS service. */
+void addGpsDevice(const std::shared_ptr<hal::gps::GpsDevice>& device);
+
+/** Deregister a hardware device to the GPS service. */
+void removeGpsDevice(const std::shared_ptr<hal::gps::GpsDevice>& device);
+
+/** @return true when GPS is set to receive updates from at least 1 device */
+bool startReceiving();
+
+/** Turn GPS receiving off */
+void stopReceiving();
+
+/** @return true when GPS receiver is on and 1 or more devices are active */
+bool isReceiving();
+
+}