v3.25.0: OpenTracks

Changes:
- GPS is now optional incl. GPS disabled warning
- PublicAPI: other applications can now receive recorded data if they start a recording (implemented for Gadgetbridge)
- New activities: swimming, swimming open, and workout
- Removed share pic functionality

Bugfix:
- UI: speed/elevation where jumping between 0.0 and the actual value
- Tracks with emojis can be exported
