Generate weather conditions at turn start.

Weather and exact time of day information is helpful during mission
planning, so generate it at the start of the turn rather than at
takeoff time.

Another advantage aside from planning is that we can now use the wind
information to set carrier headings and takeoff runways appropriately.

qt_ui/widgets/map/QLiberationMap.py

@@ -21,6 +21,7 @@ from game import Game, db
 from game.data.aaa_db import AAA_UNITS
 from game.data.radar_db import UNITS_WITH_RADAR
 from game.utils import meter_to_feet
+from game.weather import TimeOfDay
 from gen import Conflict, PackageWaypointTiming
 from gen.ato import Package
 from gen.flights.flight import Flight, FlightWaypoint, FlightWaypointType
@@ -509,9 +510,9 @@ class QLiberationMap(QGraphicsView):
             scene.addPixmap(bg)
 
             # Apply graphical effects to simulate current daytime
-            if self.game.current_turn_daytime == "day":
+            if self.game.current_turn_time_of_day == TimeOfDay.Day:
                 pass
-            elif self.game.current_turn_daytime == "night":
+            elif self.game.current_turn_time_of_day == TimeOfDay.Night:
                 ov = QPixmap(bg.width(), bg.height())
                 ov.fill(CONST.COLORS["night_overlay"])
                 overlay = scene.addPixmap(ov)