Add value diagram windows and view models

StructureHelperCommon/Services/Exports/EntitiesToDxfExportLogic.cs

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+using netDxf;
+using netDxf.Entities;
+using netDxf.Tables;
+using StructureHelperCommon.Models.Shapes;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Services.Exports
+{
+    public class EntitiesToDxfExportLogic : IExportToFileLogic
+    {
+        private const double metresToMillimeters = 1000.0;
+        private IGetDxfLayerLogic layerLogic = new GetDxfLayerLogic();
+        public List<(EntityObject entity, LayerNames layerName)> Entities { get; set; } = [];
+
+        public string FileName { get; set; }
+
+        public void Export()
+        {
+            DxfDocument dxf = new DxfDocument();
+            foreach (var shape in Entities)
+            {
+                Layer layer = layerLogic.GetOrCreateLayer(dxf, shape.layerName);
+                var entity = shape.entity;
+                entity.Layer = layer;
+                dxf.Entities.Add(entity);
+            }
+            dxf.Save(FileName);
+        }
+    }
+}