v3.17.3: OpenTracks

WARNING: The v3.17.0+ releases contain a memory leak.
This issues is NOT FIXED by this release.
It is recommended to not upgrade if you still use a release before v3.17.0

Bugfix:
- Crash if using pace for voice announcements (introduced in v3.17.0)
- Statistics showed pace initially (introduced in v3.17.0)
- Rare crash when deleting tracks