Lower roll value in manual input to do straighter trajectories

See merge request !4

Fix autocontinue to go straight
Fix angle difference when absolute value is greater than 180

See merge request !3

- use positions provided by the GPS to get an accurate timestamp
- remove telemetry variables

Remove:
- setTargetAltitude
- setTargetCoordinatesXYZ
- setTargetLatLong

See merge request !2

Add a wrapper for fixedwings drone control functions of MavSDK as well as code to use publish and subscribe functionnalities of OPC-UA # Please enter the commit message for your changes. Lines starting