defines a kind of road that can be placed on the map with a RoadBuilder and an IRoadManager
 in THREE that is just a single road that evolves to a fancier version as defined in RoadStage
 the urban demo has multiple roads with seperate road networks(MultiRoadManager) 
https://citybuilder.softleitner.com/manual/walkers
 
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| RoadStage  | GetStage (Vector2Int point, ILayerManager layerManager=null) | 
|   | checks which stage of the road fulfills all layer requirements at the given point  
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TileBase  | GetTile (Vector2Int point, ILayerManager layerManager=null) | 
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int  | GetIndex (Vector2Int point, ILayerManager layerManager=null) | 
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static T  | GetKeyedObject< T > (string key) | 
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◆ GetStage()
checks which stage of the road fulfills all layer requirements at the given point 
- Parameters
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    | point | the point on the map to check for the requirements | 
  
   
- Returns