Added GenerateMask to AssetsHelpers;

Editor/AssetsHelpers/Implementation/Texture/GenerateMask/GenerateMaskMenu.cs

@@ -0,0 +1,33 @@
+using UnityEditor;
+using UnityEngine;
+
+namespace Misaki.ArtToolEditor
+{
+    internal class GenerateMaskMenu
+    {
+        [MenuItem("Assets/Art Tools/Texture Helpers/Generate Mask", true)]
+        public static bool GenerateMaskValidator()
+        {
+            foreach (var selectedObject in Selection.objects)
+            {
+                if (selectedObject is not Texture2D)
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        [MenuItem("Assets/Art Tools/Texture Helpers/Generate Mask")]
+        public static void GenerateMask()
+        {
+            var window = EditorWindow.GetWindow<OutputOptionsWindow>(true, "Generate Mask Output Options");
+            window.WithItemSource(Selection.objects);
+            window.RegisterVisualProvider<GenerateMaskVisualProvider>();
+            window.RegisterProcessor<GenerateMaskProcessor>();
+
+            window.InitializeAndShow();
+        }
+    }
+}