Reapply "OBT1.1.0 Merge branch 'dev_pte' into dev"

This reverts commit 046483b9da.

Barotrauma/BarotraumaShared/SharedSource/Items/Components/ElectricalDischarger.cs

@@ -3,6 +3,7 @@ using Barotrauma.Networking;
 using FarseerPhysics;
 using Microsoft.Xna.Framework;
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -10,11 +11,8 @@ namespace Barotrauma.Items.Components
 {
     partial class ElectricalDischarger : Powered, IServerSerializable
     {
-        private static readonly List<ElectricalDischarger> list = new List<ElectricalDischarger>();
-        public static IEnumerable<ElectricalDischarger> List
-        {
-            get { return list; }
-        }
+        private static readonly ConcurrentDictionary<ElectricalDischarger, byte> _dischargerDict = new ConcurrentDictionary<ElectricalDischarger, byte>();
+        public static IEnumerable<ElectricalDischarger> List => _dischargerDict.Keys;
 
         const int MaxNodes = 100;
         const float MaxNodeDistance = 150.0f;
@@ -115,7 +113,7 @@ namespace Barotrauma.Items.Components
         public ElectricalDischarger(Item item, ContentXElement element) : 
             base(item, element)
         {
-            list.Add(this);
+            _dischargerDict.TryAdd(this, 0);
 
             foreach (var subElement in element.Elements())
             {
@@ -604,7 +602,7 @@ namespace Barotrauma.Items.Components
         protected override void RemoveComponentSpecific()
         {
             base.RemoveComponentSpecific();
-            list.Remove(this);
+            _dischargerDict.TryRemove(this, out _);
         }
 
         public void ServerEventWrite(IWriteMessage msg, Client c, NetEntityEvent.IData extraData = null)