[AK][GUI] Add support for sprites with an external alpha texture

- Added support for Arknights chararts sprites
- Added support for Arknights avg sprites

AssetStudioGUI/Components/Arknights/AvgSpriteConfig.cs

@@ -0,0 +1,30 @@
+using AssetStudio;
+
+namespace Arknights.AvgCharHub
+{
+    internal class AvgAssetIDs
+    {
+        public int m_FileID { get; set; }
+        public long m_PathID { get; set; }
+    }
+
+    internal class AvgSpriteData
+    {
+        public AvgAssetIDs Sprite { get; set; }
+        public AvgAssetIDs AlphaTex { get; set; }
+        public string Alias { get; set; }
+        public bool IsWholeBody { get; set; }
+    }
+
+    internal class AvgSpriteConfig
+    {
+        public AvgSpriteData[] Sprites { get; set; }
+        public Vector2 FaceSize { get; set; }
+        public Vector3 FacePos { get; set; }
+    }
+
+    internal class AvgSpriteConfigGroup
+    {
+        public AvgSpriteConfig[] SpriteGroups { get; set; }
+    }
+}