XCSoar

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- fix horizon roll/pitch
- improve font scaling in the vario gauge
- support gestures and double click on Horizon page
- keep showing disappeared FLARM traffic for some time
- support waypoints without elevation data
- IMI: fix crash when there are more than 128 recorded flights
- FLARM: parse AircraftType hex values correctly in PFLAA
- don't disable IOIO completely if Bluetooth permission was not granted
- fix crash with initial IOIO connection