changed to use attribute to add items to the content context menu, this also allows users to add their own items to the CM

Source/Engine/Scripting/Attributes/Editor/ContentContextMenu.cs

@@ -0,0 +1,26 @@
+using System;
+
+namespace FlaxEngine
+{
+    /// <summary>
+    /// This attribute is used to show content items that can be created in the content browser context menu. Separate the subcontext menus with a /. 
+    /// </summary>
+    [Serializable]
+    [AttributeUsage(AttributeTargets.Class)]
+    public class ContentContextMenuAttribute : Attribute
+    {
+        /// <summary>
+        /// The path to be used in the context menu
+        /// </summary>
+        public string Path;
+
+        /// <summary>
+        /// Initializes a new instance of the  <see cref="ContentContextMenuAttribute"/> class.
+        /// </summary>
+        /// <param name="path">The path to use to create the context menu</param>
+        public ContentContextMenuAttribute(string path)
+        {
+            Path = path;
+        }
+    }
+}