Fixes dupe exception (#258)

- [X] Cleans up ActivatorUtil
- [X] Fixes dupe exception
- [X] Fixes a bug in BasePotion
- [X] Fixes a few possible memory leaks

Bumps release version

Projects/UOContent/Engines/Quests/Core/QuestSerializer.cs

@@ -3,13 +3,13 @@ using Server.Utilities;
 
 namespace Server.Engines.Quests
 {
-    public class QuestSerializer
+    public static class QuestSerializer
     {
         public static object Construct(Type type)
         {
             try
             {
-                return ActivatorUtil.CreateInstance(type);
+                return type.CreateInstance<object>();
             }
             catch
             {