Added GraphicsExtentions class to the plugin API

src/DesktopMagicPluginAPI/Drawing/FontComparer.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DesktopMagicPluginAPI.Drawing
+{
+    internal class FontComparer : IEqualityComparer<Font>
+    {
+        public bool Equals(Font font1, Font font2)
+        {
+            if (font1.Name != font2.Name) return false;
+            if (font1.SizeInPoints != font2.SizeInPoints) return false;
+            if (font1.Style != font2.Style) return false;
+            return true;
+        }
+
+        public int GetHashCode([DisallowNull] Font obj)
+        {
+            return obj.GetHashCode();
+        }
+    }
+}