Add image brushes as a construct, as well as move some resource types to Common assembly.

Dashboard.Common/Drawing/Brush.cs

@@ -1,4 +1,5 @@
 using System.Drawing;
+using System.Numerics;
 
 namespace Dashboard.Drawing
 {
@@ -10,4 +11,15 @@ namespace Dashboard.Drawing
     {
         public Color Color { get; } = color;
     }
+
+    public class ImageBrush(Image image) : Brush
+    {
+        public Box2d TextureCoordinates { get; set; } = new Box2d(0, 0, 1, 1);
+    }
+
+    public class NinePatchImageBrush(Image image) : Brush
+    {
+        public Box2d CenterCoordinates { get; set; } = new Box2d(0, 0, 1, 1);
+        public Vector4 Extents { get; set; } = Vector4.Zero;
+    }
 }