[board] Implement Default for BitBoard and Color

board/src/bitboard/bitboard.rs

@@ -81,6 +81,12 @@ impl BitBoard {
     }
 }
 
+impl Default for BitBoard {
+    fn default() -> Self {
+        BitBoard::empty()
+    }
+}
+
 impl From<Square> for BitBoard {
     fn from(value: Square) -> Self {
         BitBoard(1 << value as u64)

board/src/piece.rs

@@ -26,6 +26,12 @@ impl Color {
     }
 }
 
+impl Default for Color {
+    fn default() -> Self {
+        Color::White
+    }
+}
+
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub enum Shape {
     Pawn = 0,