[Board] Move DefinedBoards to BitBoard

BitBoard.h

@@ -3,9 +3,27 @@
 
 #include <cstdint>
 #include <ostream>
+#include "Square.hpp"
+
+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),
+};
 
 class BitBoard final {
+
 public:
+
     using U64 = uint64_t;
 
     BitBoard(U64 v = 0);