[Board] Move DefinedBoards to BitBoard

Board.hpp

@@ -44,21 +44,6 @@ private:
     CastlingRights mCR = CastlingRights::None;
     std::optional<Square> mEPS;
 
-    enum DefinedBoards : uint64_t {
-        AFile = 0x0101010101010101,
-        BFile = AFile << 1,
-        CFile = AFile << 2,
-        DFile = AFile << 3,
-        EFile = AFile << 4,
-        FFile = AFile << 5,
-        GFile = AFile << 6,
-        HFile = AFile << 7,
-        WhiteCastlingRank = (1ULL << A2) - 1,
-        BlackCastlingRank = (~1ULL << H7),
-        CastlingRanks = WhiteCastlingRank | BlackCastlingRank,
-        CastlingSquares = (WhiteCastlingRank | BlackCastlingRank) & (CFile | GFile),
-    };
-
     void handleCastlingRights(const Piece &piece, const BitBoard &bb);
     // Check if the move is castling without checking the rights or validity.
     static bool isMoveCastling(const BitBoard &from, const BitBoard &to, const Piece &piece);