Reduce fuel for fast-forwarded player flights.

This only has an effect for aircraft for which we have fuel consumption
data, but that's fine.

Fixes https://github.com/dcs-liberation/dcs_liberation/issues/1681

game/utils.py

@@ -5,7 +5,7 @@ import math
 import random
 from collections import Iterable
 from dataclasses import dataclass
-from typing import Union, Any, TypeVar
+from typing import TypeVar, Union
 
 METERS_TO_FEET = 3.28084
 FEET_TO_METERS = 1 / METERS_TO_FEET
@@ -20,6 +20,8 @@ KPH_TO_MS = 1 / MS_TO_KPH
 INHG_TO_HPA = 33.86389
 INHG_TO_MMHG = 25.400002776728
 
+LBS_TO_KG = 0.453592
+
 
 @dataclass(frozen=True, order=True)
 class Distance: