Display platform geometry

The relative placement of e.g. stairs and elevators could be beneficial for orientation and route optimization. If this is already mapped as geometry, this should be displayed as an extra aid.

Start by locating where platform geometry is represented and where station information is displayed. Determine whether stairs and elevators are already available as geometry, then define how their relative placement should appear as an orientation or route-optimization aid; done means the relevant geometry is visibly displayed and supports the intended use.

Written by the indexing model from the issue text.