geofence: remove fence & fence_vertex messages

- this was never read
- it was implemented wrong, leading to memory access violations in
  publishFence (an integer was passed instead of the fence_s struct)

src/modules/navigator/geofence.h

@@ -43,6 +43,11 @@
 
 #include <cfloat>
 
+#include <uORB/topics/vehicle_global_position.h>
+#include <uORB/topics/vehicle_gps_position.h>
+#include <uORB/topics/sensor_combined.h>
+#include <uORB/topics/home_position.h>
+#include <controllib/blocks.hpp>
 #include <controllib/block/BlockParam.hpp>
 #include <controllib/blocks.hpp>
 #include <drivers/drv_hrt.h>
@@ -99,8 +104,6 @@ public:
 	 */
 	void addPoint(int argc, char *argv[]);
 
-	void publishFence(unsigned vertices);
-
 	int loadFromFile(const char *filename);
 
 	bool isEmpty() {return _vertices_count == 0;}
@@ -114,7 +117,8 @@ public:
 private:
 	Navigator	*_navigator{nullptr};
 
-	orb_advert_t	_fence_pub{nullptr};			/**< publish fence topic */
+	home_position_s _home_pos{0};
+	bool _home_pos_set{false};
 
 	hrt_abstime _last_horizontal_range_warning{0};
 	hrt_abstime _last_vertical_range_warning{0};