实现bake的自动化，但是autoorient的重建还是需要一些优化

Signed-off-by: TRAfoer <lhf190@outlook.com>

Assets/Scripts/EditorGame/GameElements/EnvironmentObjects/FixedTrackMesh.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Ichni.Editor;
+using Ichni.RhythmGame.Beatmap;
+using Lean.Pool;
+using UnityEngine;
+
+namespace Ichni.RhythmGame
+{
+    public class FixedTrackMesh : GameElement, IHaveTransformSubmodule
+    {
+        public TransformSubmodule transformSubmodule { get; set; }
+        public MeshFilter meshFilter;
+        public MeshRenderer meshRenderer;
+        public Mesh mesh
+        {
+            get => _mesh;
+            set
+            {
+                _mesh = value;
+                if (meshFilter != null)
+                {
+                    meshFilter.mesh = _mesh;
+                }
+            }
+        }
+        private Mesh _mesh;
+        // public static override void GenerateElement(string elementName, Guid id, List<string> tags,
+        //     bool isFirstGenerated, string themeBundleName, string objectName, GameElement parentElement)
+        // {
+
+        // }
+    }
+}

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