Troop cost/wage inflation

.cs

	public static class Util
	{
		struct PriceInflation
		{
			public int UpdatedDay;

			public bool NeedsUpdate => (int)Campaign.Current.CampaignStartTime.ElapsedDaysUntilNow > UpdatedDay;
			public float Inflation;
		};

		private static Dictionary<object, PriceInflation> categoryInflation = new Dictionary<object, PriceInflation>();

		private static float GetGlobalAverageBuyPrice(ItemObject item)
		{
			return Town.AllTowns.Select(t => (float)t.MarketData.GetPrice(item)).Average();
		}

		private static float GetBasePrice(ItemObject item)
		{
			return item.Value * 1.5f; // 1.5 is just a hack to estimate an base game "real" average price from the base price
		}

		public static float GetInflation(object key, IEnumerable<ItemObject> items)
		{
			if(!categoryInflation.TryGetValue(key, out PriceInflation inf) || inf.NeedsUpdate)
			{
				inf = new PriceInflation
				{
					UpdatedDay = (int)Campaign.Current.CampaignStartTime.ElapsedDaysUntilNow,
					Inflation =
						items
						.Select(i => GetGlobalAverageBuyPrice(i) / GetBasePrice(i))
						.Average()
				};
				categoryInflation[key] = inf;
			}
			return inf.Inflation;
		}
	}

	[HarmonyPatch(typeof(DefaultPartyWageModel), "GetTroopRecruitmentCost")]
	public class DefaultPartyWageModel_GetTroopRecruitmentCost_Patch
	{
		static void Postfix(CharacterObject troop, Hero buyerHero, bool withoutItemCost, ref int __result)
		{
			var cats = troop.AllEquipments
				.SelectMany(e => Enumerable.Range(0, 12).Select(i => e[i].Item).Where(ei => ei != null));
			__result = (int)Math.Ceiling(__result * Util.GetInflation(troop, cats));
		}
	}

	[HarmonyPatch(typeof(CharacterObject), "TroopWage", MethodType.Getter)]
	public class CharacterObject_TroopWage_Getter_Patch
	{
		static void Postfix(CharacterObject __instance, ref int __result)
		{
			var cats = __instance.AllEquipments
				.SelectMany(e => Enumerable.Range(0, 12).Select(i => e[i].Item).Where(ei => ei != null));
			__result = (int)Math.Ceiling(__result * Util.GetInflation(__instance, cats));
		}
  }