Rename fn names for better readability

src/board/board.rs

@@ -183,13 +183,6 @@ impl Board {
         }
     }
 
-    pub fn all_pieces(&mut self) -> (&mut [Piece; 6], &mut [Piece; 6]) {
-        match self.state.current_player() {
-            Color::White => (&mut self.white_pieces, &mut self.black_pieces),
-            Color::Black => (&mut self.black_pieces, &mut self.white_pieces),
-        }
-    }
-
     pub fn move_piece(&mut self, src: usize, dst: usize, piece_type: PieceType) {
         let pieces = self.own_pieces();
         pieces[piece_type].bitboard &= !square_to_bitboard(src);