feat(重构): 重构棋盘和棋子的逻辑

- 重构了 ChessBoard 和 ChessPiece 类的逻辑
- 添加了新版本的 ChineseChess 库
- 删除了旧版本的 VirtualBoard 和 VirtualPiece 类
- 更新了相关的场景和脚本

Scripts/Src/IBoard.cs

@@ -0,0 +1,32 @@
+using System;
+using Vector2I = Vector.Vector2I;
+
+public interface IBoard {
+    public int Rows { get; }
+    public int Cols { get; }
+
+    public class SetPieceEventArgs : EventArgs {
+        public IPiece OldPiece { get; set; }
+        public IPiece NewPiece { get; set; }
+        public Vector2I Pos { get; set; }
+    }
+
+    public class MoveEventArgs : EventArgs {
+        public IPiece Piece { get; set; }
+        public Vector2I From { get; set; }
+        public Vector2I To { get; set; }
+    }
+
+    event EventHandler<IPiece> OnInsert;
+    event EventHandler<IPiece> OnRemove;
+    event EventHandler<MoveEventArgs> OnMove;
+    event EventHandler<SetPieceEventArgs> OnSetPiece;
+
+    bool IsPosOutOfRange(Vector2I pos);
+    IPiece GetPiece(Vector2I pos);
+    IPiece SetPiece(IPiece piece, Vector2I pos);
+    bool InsertPiece(IPiece piece, Vector2I pos);
+    bool MovePiece(Vector2I from, Vector2I to);
+    IPiece RemovePiece(Vector2I pos);
+    void Clear();
+}