[position, board] Remove a bunch of dead code

board/src/move_counter.rs

@@ -1,74 +0,0 @@
-use chessfriend_core::Color;
-
-#[derive(Default)]
-pub enum AdvanceHalfMove {
-    Reset,
-    #[default]
-    Advance,
-}
-
-#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
-pub struct Clock {
-    /// The number of completed turns. A turn finishes when every player has moved.
-    pub full_move_number: u16,
-
-    /// The number of moves by all players since the last pawn advance or capture.
-    pub half_move_number: u16,
-}
-
-impl Clock {
-    pub fn advance(&mut self, advance_half_move: &AdvanceHalfMove) {
-        let next_color = self.active_color.next();
-
-        match self.active_color {
-            Color::Black => self.full_move_number += 1,
-            Color::White => {}
-        }
-
-        self.half_move_number = match advance_half_move {
-            AdvanceHalfMove::Reset => 0,
-            AdvanceHalfMove::Advance => self.half_move_number + 1,
-        };
-
-        self.active_color = next_color;
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn default_state() {
-        let clock = Clock::default();
-        assert_eq!(clock.active_color, Color::White);
-        assert_eq!(clock.half_move_number, 0);
-        assert_eq!(clock.full_move_number, 0);
-    }
-
-    #[test]
-    fn advance() {
-        let mut clock = Clock::default();
-
-        clock.advance(&AdvanceHalfMove::default());
-        assert_eq!(clock.active_color, Color::Black);
-        assert_eq!(clock.half_move_number, 1);
-        assert_eq!(clock.full_move_number, 0);
-
-        clock.advance(&AdvanceHalfMove::default());
-        assert_eq!(clock.active_color, Color::White);
-        assert_eq!(clock.half_move_number, 2);
-        assert_eq!(clock.full_move_number, 1);
-
-        clock.advance(&AdvanceHalfMove::default());
-        assert_eq!(clock.active_color, Color::Black);
-        assert_eq!(clock.half_move_number, 3);
-        assert_eq!(clock.full_move_number, 1);
-
-        // The half move clock resets after a capture or pawn push.
-        clock.advance(&AdvanceHalfMove::Reset);
-        assert_eq!(clock.active_color, Color::White);
-        assert_eq!(clock.half_move_number, 0);
-        assert_eq!(clock.full_move_number, 2);
-    }
-}