Remove threadlocal dependence

Simulator/Actions/CarefulObservation.cs

@@ -6,12 +6,12 @@ internal sealed class CarefulObservation : BaseAction
     public override int Level => 55;
     public override uint ActionId => 100395;
 
-    public override int CPCost => 0;
     public override int DurabilityCost => 0;
     public override bool IncreasesStepCount => false;
 
-    public override bool CanUse => Simulation.Input.Stats.IsSpecialist && Simulation.ActionStates.CarefulObservationCount < 3;
+    public override int CPCost(Simulator s) => 0;
 
-    public override void UseSuccess() =>
-        Simulation.StepCondition();
+    public override bool CanUse(Simulator s) => s.Input.Stats.IsSpecialist && s.ActionStates.CarefulObservationCount < 3;
+
+    public override void UseSuccess(Simulator s) => s.StepCondition();
 }