Allow factions to specify their cargo ship type.

https://github.com/dcs-liberation/dcs_liberation/issues/3039

game/factions/faction.py

@@ -45,6 +45,9 @@ class Faction:
     #: choose the default locale.
     locales: Optional[List[str]]
 
+    # The unit type to spawn for cargo shipping.
+    cargo_ship: ShipUnitType
+
     # Country used by this faction
     country: Country
 
@@ -194,7 +197,11 @@ class Faction:
                 "country ID"
             ) from ex
 
-        faction = Faction(locales=json.get("locales"), country=country)
+        faction = Faction(
+            locales=json.get("locales"),
+            country=country,
+            cargo_ship=ShipUnitType.named(json.get("cargo_ship", "Handy Wind"))
+        )
 
         faction.name = json.get("name", "")
         if not faction.name:

game/missiongenerator/cargoshipgenerator.py

@@ -4,7 +4,6 @@ import itertools
 from typing import TYPE_CHECKING
 
 from dcs import Mission
-from dcs.ships import HandyWind
 from dcs.unitgroup import ShipGroup
 
 from game.transfers import CargoShip
@@ -30,15 +29,16 @@ class CargoShipGenerator:
                     self.generate_cargo_ship(ship)
 
     def generate_cargo_ship(self, ship: CargoShip) -> ShipGroup:
+        coalition = self.game.coalition_for(ship.player_owned)
         waypoints = ship.route
 
-        country = self.game.coalition_for(ship.player_owned).faction.country
+        country = coalition.faction.country
         country = self.mission.country(country.name)
 
         group = self.mission.ship_group(
             country,
             ship.name,
-            HandyWind,
+            coalition.faction.cargo_ship.dcs_unit_type,
             position=waypoints[0],
             group_size=1,
         )