vehicles: align turn directions in increments of 15 degrees #26671
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Summary
SUMMARY: Bugfixes "vehicles: align turn directions in increments of 15 degrees"
Purpose of change
Fixes #26549
Smooth a vehicle's turn direction to be in increments of 15 degrees.
Describe the solution
When updating a vehicle's turn direction, return an canonical turn direction that is the rounded direction in increments of 15 degrees.
Facing should eventually align with turn direction as the vehicle moves.
Describe alternatives you've considered
Storing the actual turn direction in increments of 1 degree but smooth it out for all uses is more complicated without making things better.