v1.7.0
- add: gpx files can be uploaded and attached to a track
- add: gpx files can be viewed on an interactive map
- add: show an elevation chart for gpx tracks on map
- add: show a speed chart for gpx tracks on map
- add: a single gpx track on map will be shown with "hotline" feature (green to red gradient along the track showing the speed)
- add: automatically join multiple track and segments in gpx files to allow them to be shown on map