WIP: introducing mesh approach for modelling road surface

[clemenshabedank]

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As discussed in the Road Network Model working group, OSI lacks a model of the road surface. This leads to a lot of unclearity, e.g. it is not clear, in which direction the hight of road elements or objects should point to (as discussed in #436).
Furthermore, the road topology might be important input to sensor models (e.g. for reflection-based sensor models).

Two approaches for modelling the road surface were discussed (grid approach and spline / polynomial approaches). This is a suggestion for describing the road topology with a grid approach.

Certain things need to be discussed (see inline TODO).

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• My suggestion follows the style and contributors guidelines.
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[kmeids]

@clemenshabedank
Any progress on this topic? We need to finalize this for V3.5.

[clemenshabedank]

This is an alternative approach for describing the road surface to #619. Since we are currently following the approach in PR619 in the road model group, I close this PR for now. PR619 will be put ReadyForCCBReview for the next CCB meeting.