refactor: game state

Author: Kacperacy

src/board/move_generation.rs

@@ -7,7 +7,7 @@ impl Board {
         let mut moves = Vec::new();
 
         // 50 moves draw
-        if self.halfmove_clock >= 100 {
+        if self.game_state.fifty_move_ply_count >= 100 {
             return moves;
         }
 
@@ -77,7 +77,7 @@ impl Board {
             }
 
             // EN PASSANT
-            if let Some(ep) = self.en_passant_square {
+            if let Some(ep) = self.game_state.en_passant_square {
                 if left == ep {
                     moves.push(Move {
                         from,

src/board/zobrist.rs

@@ -56,12 +56,12 @@ impl Zobrist {
         }
 
         for i in 0..4 {
-            if board.castling_rights & (1 << i) != 0 {
+            if board.game_state.castling_rights & (1 << i) != 0 {
                 hash ^= self.castling_rights[i];
             }
         }
 
-        if let Some(en_passant) = board.en_passant_square {
+        if let Some(en_passant) = board.game_state.en_passant_square {
             hash ^= self.en_passant[en_passant % 8];
         }