Lane detection

[jruths]

We need a node to process sensing data (image and maybe lidar?) to produce individual lanes.

• Ideally these lanes would be annotated with lanes going in the same direction as the vehicle and lanes going the opposite direction. (using yellow vs white lines)
• Using road markings for turn/straight arrows to indicate other information about the lane would be interesting too.

This node may be quite related to the Driveable surface segmentation node.