v3.16.0: OpenTracks

Changes:
- Cycling: get distance from BLE speed sensor
- Reworked UI presented while recording
- UI performance optimizations
- Exported filenames: <First 32bits UUID>_<track's name>.<extension> 
- Import multiple files via Intent (e.g., from Gadgetbridge)
- GPX: export power data
- Updated translations

Bugfix:
- Voice announcement use minutes correctly
