Update client.UnreceivedEntityEventCount on every event write

I noticed that if the main event IDs went over 10000 and there were more than 450 unique events, the server would sometimes skip the next event the client needed. Sometimes the client would also not realize that the last event it received was the final init event, so it would reject all further events because of a huge ID discrepancy. The init events will likely need to be reworked, but updating UnreceivedEntityEventCount seems to help somewhat.

Subsurface/Source/Networking/NetEntityEvent/ServerEntityEventManager.cs

@@ -20,6 +20,11 @@ namespace Barotrauma.Networking
             get { return events; }
         }
 
+        public List<ServerEntityEvent> UniqueEvents
+        {
+            get { return uniqueEvents; }
+        }
+
         private class BufferedEvent
         {
             public readonly Client Sender;
@@ -208,12 +213,14 @@ namespace Barotrauma.Networking
             {
                 msg.Write((byte)ServerNetObject.ENTITY_EVENT_INITIAL);
                 //how many (unique) events the clients had missed before joining
+                client.UnreceivedEntityEventCount = (UInt16)uniqueEvents.Count;
                 msg.Write(client.UnreceivedEntityEventCount);
 
                 //ID of the first event sent after the client joined 
                 //(after the client has been synced they'll switch their lastReceivedID 
                 //to the one before this, and the eventmanagers will start to function "normally")
                 msg.Write(events.Count == 0 ? (UInt16)0 : events[events.Count - 1].ID);
+
                 Write(msg, eventsToSync, client);
             }
             else