Initial attempt at fixing escorts

game/ato/flight.py

@@ -63,6 +63,7 @@ class Flight(SidcDescribable):
         self.start_type = start_type
         self.use_custom_loadout = False
         self.custom_name = custom_name
+        self.group_id: int = 0
 
         # Only used by transport missions.
         self.cargo = cargo

game/ato/package.py

@@ -129,6 +129,16 @@ class Package:
         if not self.flights:
             self.waypoints = None
 
+    @property
+    def primary_flight(self) -> Optional[Flight]:
+        task = self.primary_task
+        if not task:
+            return None
+        primaries = [x for x in self.flights if x.flight_type == task]
+        if len(primaries) > 0:
+            return primaries[0]
+        return None
+
     @property
     def primary_task(self) -> Optional[FlightType]:
         if not self.flights: