Openvario-shell

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- Ability to read NMEA stream from connected serial devices, with baud rate
autodetection. Display detected devices on top bar.
- System upgrade app. Fetch packages from opkg sources (internet or locally
mounted USB stick), allow to pick packages to upgrade.
- Automatically set system date and time from GPS source (if system time is
found to be out-of-sync). Show system time on top bar. Red indicator turns
black when current time is detected in GPS NMEA stream.
- Clear the screen when exiting to shell

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- Log downloader app. Supports downloading `*.igc` as well as `*.nmea` files.
- Autostart chosen application when openvario shell is started. Application and
timeout is configurable in settings.
- More languages for XCSoar to choose from

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- Initial API to support 3rd party apps.
- Do not write to xcsoar profile on startup if no changes are made.
- Add more language choices for XCSoar.

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- Initial release