Improved GPS Settings app and GPS service (#222)

- Fixes and improvements to `GpsSettings` app, `GpsDevice` and `GpsService`
- Implemented location/GPS statusbar icon
- Added app icon
- Added support for other GPS models (based on Meshtastic code)

TactilityHeadless/Private/Tactility/hal/gps/Probe.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "Tactility/hal/gps/GpsDevice.h"
+#include "Tactility/hal/uart/Uart.h"
+
+namespace tt::hal::gps {
+
+struct GpsInfo;
+
+GpsModel probe(uart_port_t port);
+
+}