changed how the actor toolbox is created. Allows fo user to enter their own tabs and actors with an attribute

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

@@ -0,0 +1,26 @@
+using System;
+
+namespace FlaxEngine
+{
+    /// <summary>
+    /// This attribute is used to show actors that can be created in the actor tab of the toolbox.
+    /// </summary>
+    [Serializable]
+    [AttributeUsage(AttributeTargets.Class)]
+    public class ActorToolboxAttribute : Attribute
+    {
+        /// <summary>
+        /// The path to be used in the tool box
+        /// </summary>
+        public string Group;
+        
+        /// <summary>
+        /// Initializes a new instance of the  <see cref="ActorToolboxAttribute"/> class.
+        /// </summary>
+        /// <param name="group">The group to use to create the tab</param>
+        public ActorToolboxAttribute(string group)
+        {
+            Group = group;
+        }
+    }
+}