Rename movegen module files and make readability improvements

src/search/quiescence.rs

@@ -18,12 +18,17 @@ pub fn quiescence(game: &mut Game, mut alpha: i32, beta: i32) -> (Option<Move>,
         alpha = stand_pat;
     }
 
-    let mut captures: Vec<_> = game.board.pseudo_moves_all().into_iter().filter(|m| {
-        matches!(
-            m.move_type,
-            MoveType::Capture | MoveType::PromotionCapture(_)
-        )
-    }).collect();
+    let mut captures: Vec<_> = game
+        .board
+        .pseudo_moves_all()
+        .into_iter()
+        .filter(|m| {
+            matches!(
+                m.move_type,
+                MoveType::Capture | MoveType::PromotionCapture(_)
+            )
+        })
+        .collect();
 
     captures.sort_unstable_by_key(|mv| score_by_mvv_lva(&game.board, *mv));