v3.19.0: OpenTracks

Changes:
- Support for Running Speed and Cadence (RCS) sensors implemented
- When sharing a track: a share picture is created
- No vibration when starting a recording
- While recording: UI shows most recently received altitude, speed, and bearing (even if not stored)

Bugfix:
- Computation of total duration should not include paused durations (requires re-import)
- (again) Use custom summaries if present

Developer:
- Upgrade to SDK31 and AGP7.0.0 (requires JDK11)
- TrackRec