Move mission range data into the aircraft type.

The doctrine/task limits were capturing a reasonable average for the
era, but it did a bad job for cases like the Harrier vs the Hornet,
which perform similar missions but have drastically different max
ranges. It also forced us into limiting CAS missions (even those flown
by long range aircraft like the A-10) to 50nm since helicopters could
commonly be fragged to them.

This should allow us to design campaigns without needing airfields to be
a max of ~50-100nm apart.

game/dcs/aircrafttype.py

@@ -29,7 +29,7 @@ from game.radio.channels import (
     ViggenRadioChannelAllocator,
     NoOpChannelAllocator,
 )
-from game.utils import Distance, Speed, feet, kph, knots
+from game.utils import Distance, Speed, feet, kph, knots, nautical_miles
 
 if TYPE_CHECKING:
     from gen.aircraft import FlightData
@@ -112,13 +112,18 @@ class AircraftType(UnitType[Type[FlyingType]]):
     lha_capable: bool
     always_keeps_gun: bool
 
-    # If true, the aircraft does not use the guns as the last resort weapons, but as a main weapon.
-    # It'll RTB when it doesn't have gun ammo left.
+    # If true, the aircraft does not use the guns as the last resort weapons, but as a
+    # main weapon. It'll RTB when it doesn't have gun ammo left.
     gunfighter: bool
 
     max_group_size: int
     patrol_altitude: Optional[Distance]
     patrol_speed: Optional[Speed]
+
+    #: The maximum range between the origin airfield and the target for which the auto-
+    #: planner will consider this aircraft usable for a mission.
+    max_mission_range: Distance
+
     intra_flight_radio: Optional[Radio]
     channel_allocator: Optional[RadioChannelAllocator]
     channel_namer: Type[ChannelNamer]
@@ -230,6 +235,13 @@ class AircraftType(UnitType[Type[FlyingType]]):
         radio_config = RadioConfig.from_data(data.get("radios", {}))
         patrol_config = PatrolConfig.from_data(data.get("patrol", {}))
 
+        try:
+            mission_range = nautical_miles(int(data["max_range"]))
+        except (KeyError, ValueError):
+            mission_range = (
+                nautical_miles(50) if aircraft.helicopter else nautical_miles(150)
+            )
+
         try:
             introduction = data["introduced"]
             if introduction is None:
@@ -257,6 +269,7 @@ class AircraftType(UnitType[Type[FlyingType]]):
                 max_group_size=data.get("max_group_size", aircraft.group_size_max),
                 patrol_altitude=patrol_config.altitude,
                 patrol_speed=patrol_config.speed,
+                max_mission_range=mission_range,
                 intra_flight_radio=radio_config.intra_flight,
                 channel_allocator=radio_config.channel_allocator,
                 channel_namer=radio_config.channel_namer,