Move mission generation code into game.

Operation has been renamed MissionGenerator and is no longer a static
class.

game/missiongenerator/environmentgenerator.py

@@ -0,0 +1,42 @@
+from typing import Optional
+
+from dcs.mission import Mission
+
+from game.weather import Clouds, Fog, Conditions, WindConditions, AtmosphericConditions
+
+
+class EnvironmentGenerator:
+    def __init__(self, mission: Mission, conditions: Conditions) -> None:
+        self.mission = mission
+        self.conditions = conditions
+
+    def set_atmospheric(self, atmospheric: AtmosphericConditions) -> None:
+        self.mission.weather.qnh = atmospheric.qnh.mm_hg
+        self.mission.weather.season_temperature = atmospheric.temperature_celsius
+
+    def set_clouds(self, clouds: Optional[Clouds]) -> None:
+        if clouds is None:
+            return
+        self.mission.weather.clouds_base = clouds.base
+        self.mission.weather.clouds_thickness = clouds.thickness
+        self.mission.weather.clouds_density = clouds.density
+        self.mission.weather.clouds_iprecptns = clouds.precipitation
+        self.mission.weather.clouds_preset = clouds.preset
+
+    def set_fog(self, fog: Optional[Fog]) -> None:
+        if fog is None:
+            return
+        self.mission.weather.fog_visibility = int(fog.visibility.meters)
+        self.mission.weather.fog_thickness = fog.thickness
+
+    def set_wind(self, wind: WindConditions) -> None:
+        self.mission.weather.wind_at_ground = wind.at_0m
+        self.mission.weather.wind_at_2000 = wind.at_2000m
+        self.mission.weather.wind_at_8000 = wind.at_8000m
+
+    def generate(self) -> None:
+        self.mission.start_time = self.conditions.start_time
+        self.set_atmospheric(self.conditions.weather.atmospheric)
+        self.set_clouds(self.conditions.weather.clouds)
+        self.set_fog(self.conditions.weather.fog)
+        self.set_wind(self.conditions.weather.wind)