Improve integration with Live2D assets

- Improved export method of AnimationClip motions
- [GUI] Added display of model info on the preview tab
- [GUI] Added support for partial export:
  - selected models
  - model + selected AnimationClip motions
  - model + selected Fade motions
  - model + selected Fade Motion List

AssetStudioUtility/CubismLive2DExtractor/CubismObjectList.cs

@@ -0,0 +1,62 @@
+using System.Collections.Generic;
+using System.Linq;
+using AssetStudio;
+
+namespace CubismLive2DExtractor
+{
+    public sealed class CubismObjectList
+    {
+        public static SerializedFile AssetsFile { get; set; }
+        public HashSet<ObjectData> CubismExpressionObjects { get; set; }
+        public HashSet<ObjectData> CubismFadeMotionObjects { get; set; }
+
+        public class ObjectData
+        {
+            private long _pathID;
+            public Object Asset { get; set; }
+            public int m_FileID { get; set; }
+            public long m_PathID
+            {
+                get => _pathID;
+                set
+                {
+                    _pathID = value;
+                    Asset = GetObjByPathID(_pathID);
+                }
+            }
+
+            public override bool Equals(object obj)
+            {
+                return obj is ObjectData objectData && _pathID == objectData.m_PathID;
+            }
+
+            public override int GetHashCode()
+            {
+                return _pathID.GetHashCode();
+            }
+        }
+
+        public List<MonoBehaviour> GetFadeMotionAssetList()
+        {
+            return CubismFadeMotionObjects?.Where(x => x.Asset != null).Select(x => (MonoBehaviour)x.Asset).ToList();
+        }
+
+        public List<MonoBehaviour> GetExpressionList()
+        {
+            return CubismExpressionObjects?.Where(x => x.Asset != null).Select(x => (MonoBehaviour)x.Asset).ToList();
+        }
+
+        private static Object GetObjByPathID(long pathID)
+        {
+            var assetFileList = AssetsFile.assetsManager.assetsFileList;
+            foreach (var assetFile in assetFileList)
+            {
+                if (assetFile.ObjectsDic.TryGetValue(pathID, out var obj))
+                {
+                    return obj;
+                }
+            }
+            return null;
+        }
+    }
+}