Better platform name labels
There's several possible sources for this:
- railway=platform or public_transport=platform: sub-optimal as they often contain more than one track
- railway=platform_edge would be semantically ideal, but it seems rarely used and is possibly lost in the way the Marble vector tile generator deals with split up outer multi-polygons.
- public_transport=stop_position or railway=stop: those are per track, but on the track, not the platform
Can this be solved entirely in the style, or do we need a pre-processing step for this that normalizes this to one form?