Record gps lat, lon, satinuse from recorder app if there was gps signal. (#1992)

* Record gps lat, lon, satinuse from recorder app if there was gps signal.

* Add _GEO to filename that has geotag

firmware/application/file.hpp

@@ -155,6 +155,8 @@ struct path {
 
     path& replace_extension(const path& replacement = path());
 
+    path& append_filename(const string_type& str);
+
    private:
     string_type _s;
 };