【Revit二次开发】创建楼梯

参考

https://zhuanlan.zhihu.com/p/640975185

https://help.autodesk.com/view/RVT/2020/ENU/?guid=Revit_API_Revit_API_Developers_Guide_Revit_Geometric_Elements_Stairs_and_Railings_Creating_and_Editing_Stairs_html