v3.7.5: OpenTracks

Changes:
- Added aggregated statistics summary (from main the screen's menu)
- Dashboard API: pass "show on lock screen"- and "keep screen on"-setting
- Updated translations
- Import: be lenient with ISO8601 date format
- Show track on map: file format can be selected and opening dashboard works on Android R (API 30+)

Bugfix:
- App icon now correctly implemented