Camera Tilt和Camera Offset效果，以及退出，重载功能

Assets/Scripts/Manager/ThemeBundleManager.cs

@@ -1,6 +1,7 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
+using Ichni.StartMenu;
 using TMPro;
 using UniRx;
 using UnityEngine;
@@ -53,7 +54,12 @@ namespace Ichni
 
         public void LoadThemeBundles(List<string> list)
         {
+            AssetBundle.UnloadAllAssetBundles(true);
+            loadedThemeBundleList.Clear();
+            
+            LogWindow = StartMenuManager.instance.startPage.logText;
             LogWindow.text += "Loading ThemeBundles, Please wait...\n";
+            
             waitingBundleAmount = new IntReactiveProperty(list.Count);
             Debug.Log("Waiting for " + list.Count + " AssetBundles to load.");
             LogWindow.text += "Waiting for " + list.Count + " AssetBundles to load.\n";