Fix cases where pilots were not returned.

https://github.com/dcs-liberation/dcs_liberation/issues/276

game/game.py

@@ -387,6 +387,8 @@ class Game:
         # Update statistics
         self.game_stats.update(self)
 
+        self.blue_air_wing.reset()
+        self.red_air_wing.reset()
         self.aircraft_inventory.reset()
         for cp in self.theater.controlpoints:
             self.aircraft_inventory.set_from_control_point(cp)

game/squadrons.py

@@ -78,7 +78,7 @@ class Squadron:
         self.available_pilots.extend(new_pilots)
 
     def return_all_pilots(self) -> None:
-        self.available_pilots = self.pilots
+        self.available_pilots = list(self.pilots)
 
     @property
     def faker(self) -> Faker:
@@ -152,6 +152,10 @@ class AirWing:
     def squadron_at_index(self, index: int) -> Squadron:
         return list(self.iter_squadrons())[index]
 
+    def reset(self) -> None:
+        for squadron in self.iter_squadrons():
+            squadron.return_all_pilots()
+
     @property
     def size(self) -> int:
         return sum(len(s) for s in self.squadrons.values())

game/transfers.py

@@ -529,6 +529,7 @@ class PendingTransfers:
         flight = transport.flight
         flight.package.remove_flight(flight)
         self.game.aircraft_inventory.return_from_flight(flight)
+        flight.clear_roster()
 
     @cancel_transport.register
     def _cancel_transport_convoy(