Remove `selfReference` from `Packages` mutator

This variable didn't serve any really useful purpose, but has led to
game crashes. While adding proper cleanup could also solve these
crashes, there is no real point to keeping it at all.

NOTE: It's only purpose was to make sure only one instance of
corresponding mutator exists, but duplicates shouldn't happen in the
first place.

sources/Packages.uc

@@ -22,13 +22,6 @@
 class Packages extends Mutator
     config(Acedia);
 
-//      Default value of this variable will be used to store
-//  reference to the active Acedia mutator,
-//  as well as to ensure there's only one copy of it.
-//      We can't use 'Singleton' class for that,
-//  as we have to derive from 'Mutator'.
-var private Packages selfReference;
-
 //  Acedia's reference to a `Global` object.
 var private Global          _;
 var private ServerGlobal    _server;
@@ -56,11 +49,6 @@ struct FeatureConfigPair
     var public Text             configName;
 };
 
-static public final function Packages GetInstance()
-{
-    return default.selfReference;
-}
-
 //  "Constructor"
 simulated function PreBeginPlay()
 {
@@ -74,13 +62,6 @@ simulated function PreBeginPlay()
 
 private simulated function InitializeClient()
 {
-    //  Enforce one copy rule and remember a reference to that copy
-    if (default.selfReference != none)
-    {
-        Destroy();
-        return;
-    }
-    default.selfReference = self;
     _ = class'Global'.static.GetInstance();
     class'ClientLevelCore'.static.CreateLevelCore(self);
 }
@@ -95,13 +76,6 @@ private function InitializeServer()
         AddToPackageMap("Acedia");
     }
     CheckForGarbage();
-    //  Enforce one copy rule and remember a reference to that copy
-    if (default.selfReference != none)
-    {
-        Destroy();
-        return;
-    }
-    default.selfReference = self;
     //  Launch and setup core Acedia
     _       = class'Global'.static.GetInstance();
     _server = class'ServerGlobal'.static.GetInstance();
@@ -147,7 +121,6 @@ function ServerTraveling(string URL, bool bItems)
         _.memory.Free(votingAdapter);
         votingAdapter = none;
     }
-    default.selfReference = none;
     _.environment.ShutDown();
     if (nextMutator != none) {
     	nextMutator.ServerTraveling(URL, bItems);