* refactor: LocationProvider classes moved to src/helpers/sensors

* refactor:  Heltec_Wireless_Tracker* env moved to new variants/heltec_tracker dir

src/helpers/sensors/LocationProvider.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "Mesh.h"
+
+
+class LocationProvider {
+
+public:
+    virtual long getLatitude() = 0;
+    virtual long getLongitude() = 0;
+    virtual bool isValid() = 0;
+    virtual long getTimestamp() = 0;
+    virtual void reset();
+    virtual void begin();
+    virtual void stop();
+    virtual void loop();
+};