add cellular automata generator

addons/ca_level_generator/CaLevelGeneratorPlugin.cs

@@ -0,0 +1,33 @@
+#if TOOLS
+using Godot;
+
+namespace Mr.BrickAdventures.Tools.CaLevelGenerator;
+
+[Tool]
+public partial class CaLevelGeneratorPlugin : EditorPlugin
+{
+    private CaLevelGeneratorDock _dock;
+
+    public override void _EnterTree()
+    {
+        _dock = new CaLevelGeneratorDock { Plugin = this };
+        AddControlToDock(DockSlot.RightUl, _dock);
+        SceneChanged += OnSceneChanged;
+    }
+
+    public override void _ExitTree()
+    {
+        SceneChanged -= OnSceneChanged;
+        RemoveControlFromDocks(_dock);
+        _dock.QueueFree();
+        _dock = null;
+    }
+
+    private void OnSceneChanged(Node sceneRoot)
+    {
+        _dock?.OnSceneChanged(sceneRoot);
+    }
+
+    public EditorUndoRedoManager UndoRedo => GetUndoRedo();
+}
+#endif