Expanded max loot in pmc container systems

Now allows for per-map multipliers + pocket + vest loot uses same level-based value as backpack

labs multiplier = 2
labyrinth = 4

Removed nullability from some properties

Libraries/SPTarkov.Server.Core/Generators/BotLevelGenerator.cs

@@ -30,7 +30,7 @@ public class BotLevelGenerator(
         BotBase bot
     )
     {
-        if (!botGenerationDetails.IsPmc.GetValueOrDefault(false))
+        if (!botGenerationDetails.IsPmc)
         {
             return new RandomisedBotLevelResult { Exp = 0, Level = 1 };
         }