RT state managment and rectangle support

dotnet/AipsRT/Model/Whiteboard/Shapes/Arrow.cs

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+using AipsRT.Model.Whiteboard.Structs;
+
+namespace AipsRT.Model.Whiteboard.Shapes;
+
+public class Arrow : Shape
+{
+    public Position EndPosition { get; set; }
+    
+    public int Thickness { get; set; }
+}

dotnet/AipsRT/Model/Whiteboard/Shapes/Line.cs

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+using AipsRT.Model.Whiteboard.Structs;
+
+namespace AipsRT.Model.Whiteboard.Shapes;
+
+public class Line : Shape
+{
+    public Position EndPosition { get; set; }
+    
+    public int Thickness { get; set; }
+}

dotnet/AipsRT/Model/Whiteboard/Shapes/Map/ShapeMappingExtensions.cs

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+using AipsRT.Model.Whiteboard.Structs;
+
+namespace AipsRT.Model.Whiteboard.Shapes.Map;
+
+public static class ShapeMappingExtensions
+{
+    extension(AipsCore.Infrastructure.Persistence.Shape.Shape shape)
+    {
+        public Rectangle ToRectangle()
+        {
+            return new Rectangle()
+            {
+                Id = shape.Id,
+                Position = new Position(shape.PositionX, shape.PositionY),
+                Color = shape.Color,
+                EndPosition = new Position(shape.EndPositionX!.Value, shape.EndPositionY!.Value),
+                BorderThickness = shape.Thickness!.Value,
+            };
+        }
+
+        public Arrow ToArrow()
+        {
+            return new Arrow()
+            {
+                Id = shape.Id,
+                Position = new Position(shape.PositionX, shape.PositionY),
+                Color = shape.Color,
+                EndPosition = new Position(shape.EndPositionX!.Value, shape.EndPositionY!.Value),
+                Thickness = shape.Thickness!.Value,
+            };
+        }
+        
+        public Line ToLine()
+        {
+            return new Line()
+            {
+                Id = shape.Id,
+                Position = new Position(shape.PositionX, shape.PositionY),
+                Color = shape.Color,
+                EndPosition = new Position(shape.EndPositionX!.Value, shape.EndPositionY!.Value),
+                Thickness = shape.Thickness!.Value,
+            };
+        }
+        
+        public TextShape ToTextShape()
+        {
+            return new TextShape()
+            {
+                Id = shape.Id,
+                Position = new Position(shape.PositionX, shape.PositionY),
+                Color = shape.Color,
+                TextValue = shape.TextValue!,
+                TextSize = shape.TextSize!.Value
+            };
+        }
+    }
+}

dotnet/AipsRT/Model/Whiteboard/Shapes/Rectangle.cs

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+using AipsRT.Model.Whiteboard.Structs;
+
+namespace AipsRT.Model.Whiteboard.Shapes;
+
+public class Rectangle : Shape
+{
+    public Position EndPosition { get; set; }
+    
+    public int BorderThickness { get; set; }
+}

dotnet/AipsRT/Model/Whiteboard/Shapes/Shape.cs

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+using AipsRT.Model.Whiteboard.Structs;
+
+namespace AipsRT.Model.Whiteboard.Shapes;
+
+public abstract class Shape
+{
+    public Guid Id { get; set; }
+    
+    public Guid OwnerId { get; set; }
+
+    public Position Position { get; set; }
+    
+    public string Color { get; set; }
+}

dotnet/AipsRT/Model/Whiteboard/Shapes/TextShape.cs

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+using AipsRT.Model.Whiteboard.Shapes;
+
+namespace AipsRT.Model.Whiteboard.Shapes;
+
+public class TextShape : Shape
+{
+    public string TextValue { get; set; }
+    
+    public int TextSize { get; set; }
+}