AON2 X2 Hack 1.4.2 + Redeem Codes

- backend code improvements
- add CSV export option for individual activities
- add database import and export options

- Add paragliding activity and elevation graph
- add hiking activity and elevation graph
- add per-log KML export

-add icons to settings screen
-change activity map type to hybrid
-another fix to altitude calculation
-change splash screen
-improve connected screen
-move GPS waypoint upload button to centre to avoid overlap
-improve activity log screen

Intermediate release of critical bugfixes
Fix: don't upload duplicate log entries
Fix: correct altitude calculation algorithm
Fix: improve distance calculation

Improvements:

- Can now export logs to CSV
- Altitude over time graph added to activities stats

Fixes:

- Recalculates statistics for inaccurate logs
- Handle failed log transfers more gracefully

Improvements:
- GPS markers now persist through app closes
- The maps on the log screen and GPS screen are now draggable.
- Logs are now sorted by date
- GPS markers can be named via a edit button, instead of a long press
- Logs can be deleted via a deleted button, as well as swiping sideways


Fixes:
- Logging:
- Distance calculation fixed
- Remove erroneous logs
- Correct units are now shown (based on units selected in settings)
- Max speed now calculated