* Railings are an ON_BORDER object that looks like a railing; you can throw and reach across it, but it stops you from falling into holes or whatever.
* Mobs can climb over them (or throw other mobs over them!)
* They are construtable/deconstructable.
* Smoothly auto-joining sprites to look like a railing.
* Changes from Eris: Converted << to to_chat(), Desnowflaked some code, Fixed being able to climb over when windows are in the way.
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