Based on Minetest Game mod: stairs
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Authors of source code
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Originally by Kahrl <kahrl@gmx.net> (LGPLv2.1+) and
celeron55, Perttu Ahola <celeron55@gmail.com> (LGPLv2.1+)
Various Minetest developers and contributors (LGPLv2.1+)
http://www.gnu.org/licenses/lgpl-2.1.html
License of media (textures and sounds)
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Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
http://creativecommons.org/licenses/by-sa/3.0/
Note: This mod has been amended to add new features like transparent and glowing
stairs, slopes, recipes to return stairs / slopes back into blocks and also for
stairs to be used as fuel for furnaces, also alternative placement functions
that use on_rotate and sneak key.
