Estimate TOTs for packages.

We estimate the longest possible time from mission start to TOT for
all flights in a package and use that to set the TOT (plus any delay
used to stagger flights). This both cuts down on loiter time for
shorter flights and ensures that long flights will make it to the
target in time.

This is also used to compute the start time for the AI, so the
explicit delay option is no longer needed.

gen/flights/flight.py

@@ -97,7 +97,6 @@ class FlightWaypoint:
         # flight's offset in the UI.
         self.tot: Optional[int] = None
 
-
     @classmethod
     def from_pydcs(cls, point: MovingPoint,
                    from_cp: ControlPoint) -> "FlightWaypoint":
@@ -130,13 +129,10 @@ class Flight:
     client_count: int = 0
     use_custom_loadout = False
     preset_loadout_name = ""
-    start_type = "Runway"
     group = False # Contains DCS Mission group data after mission has been generated
 
-    # How long before this flight should take off
-    scheduled_in = 0
-
-    def __init__(self, unit_type: UnitType, count: int, from_cp: ControlPoint, flight_type: FlightType):
+    def __init__(self, unit_type: UnitType, count: int, from_cp: ControlPoint,
+                 flight_type: FlightType, start_type: str) -> None:
         self.unit_type = unit_type
         self.count = count
         self.from_cp = from_cp
@@ -144,11 +140,16 @@ class Flight:
         self.points: List[FlightWaypoint] = []
         self.targets: List[MissionTarget] = []
         self.loadout: Dict[str, str] = {}
-        self.start_type = "Runway"
+        self.start_type = start_type
+        # Late activation delay in seconds from mission start. This is not
+        # the same as the flight's takeoff time. Takeoff time depends on the
+        # mission's TOT and the other flights in the package. Takeoff time is
+        # determined by AirConflictGenerator.
+        self.scheduled_in = 0
 
     def __repr__(self):
         return self.flight_type.name + " | " + str(self.count) + "x" + db.unit_type_name(self.unit_type) \
-               + " in " + str(self.scheduled_in) + " minutes (" + str(len(self.points)) + " wpt)"
+               + " (" + str(len(self.points)) + " wpt)"
 
 
 # Test
@@ -157,6 +158,6 @@ if __name__ == '__main__':
     from theater import ControlPoint, Point, List
 
     from_cp = ControlPoint(0, "AA", Point(0, 0), Point(0, 0), [], 0, 0)
-    f = Flight(A_10C(), 4, from_cp, FlightType.CAS)
+    f = Flight(A_10C(), 4, from_cp, FlightType.CAS, "Cold")
     f.scheduled_in = 50
     print(f)