Mostely guidance related bug fixes and a fix for traffic updates.

Changes from 5.8.0:
 - Bugfixes:
   - Fixes #4152: Superflous turn left instruction, when crossing a service-road.
   - Fixes #4189: Fixes missing turn lane information after a traffic light.
   - Fixes #4199: Data race-condition when updating segment speeds.
   - Fixes #3987: Fixes obvious turn detection at T-intersections with slip-roads.
   - Fixes #4161: Don't collapse U-Turns with other steps.