[position] Misc changes

- Add a captures list to the Position struct
- Implement ToFenStr
- Update the imports list, which has been sorely out-of-date in the tree for many commits now.

position/src/position/position.rs

@@ -1,25 +1,25 @@
 // Eryn Wells <eryn@erynwells.me>
 
-use crate::{
-    check::CheckingPieces,
-    move_generator::{MoveSet, Moves},
-    sight::SightExt,
+use crate::{movement::Movement, sight::Sight};
+use chessfriend_bitboard::{BitBoard, IterationDirection};
+use chessfriend_board::{
+    display::DiagramFormatter, en_passant::EnPassant, fen::ToFenStr, Board, PlacePieceError,
+    PlacePieceStrategy,
 };
-use chessfriend_bitboard::BitBoard;
-use chessfriend_board::{castle::Castle, display::DiagramFormatter, en_passant::EnPassant, Board};
-use chessfriend_core::{Color, Piece, PlacedPiece, Shape, Square};
-use chessfriend_moves::Move;
-use std::{cell::OnceCell, fmt};
+use chessfriend_core::{Color, Piece, Square};
+use std::{cell::OnceCell, fmt, ops::BitOr};
 
+#[must_use]
 #[derive(Clone, Debug, Eq)]
 pub struct Position {
     pub board: Board,
     moves: OnceCell<Moves>,
+    pub(super) captures: [Vec<Piece>; Color::NUM],
 }
 
 impl Position {
     pub fn empty() -> Self {
-        Default::default()
+        Position::default()
     }
 
     /// Return a starting position.
@@ -225,11 +225,20 @@ impl Position {
     }
 }
 
+impl ToFenStr for Position {
+    type Error = <Board as ToFenStr>::Error;
+
+    fn to_fen_str(&self) -> Result<String, Self::Error> {
+        self.board.to_fen_str()
+    }
+}
+
 impl Default for Position {
     fn default() -> Self {
         Self {
             board: Board::default(),
             moves: OnceCell::new(),
+            captures: Default::default(),
         }
     }
 }