Scene picker: Added option to add groups of scenes to open

Editor/Toolbar/Tools/ScenePickerObjects/SceneGroup.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+
+namespace Module.NavigationTool.Editor.Toolbar
+{
+    [Serializable]
+    public sealed class SceneGroup
+    {
+        public string name;
+        public ESceneGroupFilterType filterType;
+        public string optionalMainScenePath;
+        public List<string> filters = new();
+    }
+}