EntityEvent fixes:

- Clients wait for midround syncing to finish before applying the remote state to connection panels and inventories (because the wires connected to the connection panel or items in the inventory may not exist before the EntitySpawner events have been received).
- Server writes 0 as the projectile ID if the projectile doesn't exist anymore when a Turret event is sent.
- More info in networkevent error messages.

Barotrauma/BarotraumaClient/Source/Items/Inventory.cs

@@ -1,4 +1,6 @@
 using Barotrauma.Items.Components;
+using Barotrauma.Networking;
+using Lidgren.Network;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
 using System;
@@ -464,5 +466,69 @@ namespace Barotrauma
 
             item.Sprite.Draw(spriteBatch, new Vector2(rect.X + rect.Width / 2, rect.Y + rect.Height / 2), item.GetSpriteColor());
         }
+
+        public void ClientRead(ServerNetObject type, NetBuffer msg, float sendingTime)
+        {
+            receivedItemIDs = new ushort[capacity];
+
+            for (int i = 0; i < capacity; i++)
+            {
+                receivedItemIDs[i] = msg.ReadUInt16();
+            }
+
+            //delay applying the new state if less than 1 second has passed since this client last sent a state to the server
+            //prevents the inventory from briefly reverting to an old state if items are moved around in quick succession
+
+            //also delay if we're still midround syncing, some of the items in the inventory may not exist yet
+            if (syncItemsDelay > 0.0f || GameMain.Client.MidRoundSyncing)
+            {
+                if (syncItemsCoroutine != null) CoroutineManager.StopCoroutines(syncItemsCoroutine);
+                syncItemsCoroutine = CoroutineManager.StartCoroutine(SyncItemsAfterDelay());
+            }
+            else
+            {
+                ApplyReceivedState();
+            }
+        }
+
+        private IEnumerable<object> SyncItemsAfterDelay()
+        {
+            while (syncItemsDelay > 0.0f && GameMain.Client != null && GameMain.Client.MidRoundSyncing)
+            {
+                syncItemsDelay -= CoroutineManager.DeltaTime;
+                yield return CoroutineStatus.Running;
+            }
+
+            if (Owner.Removed || GameMain.Client == null)
+            {
+                yield return CoroutineStatus.Success;
+            }
+
+            ApplyReceivedState();
+
+            yield return CoroutineStatus.Success;
+        }
+
+        private void ApplyReceivedState()
+        {
+            if (receivedItemIDs == null) return;
+
+            for (int i = 0; i < capacity; i++)
+            {
+                if (receivedItemIDs[i] == 0)
+                {
+                    if (Items[i] != null) Items[i].Drop();
+                }
+                else
+                {
+                    var item = Entity.FindEntityByID(receivedItemIDs[i]) as Item;
+                    if (item == null) continue;
+
+                    TryPutItem(item, i, true, true, null, false);
+                }
+            }
+
+            receivedItemIDs = null;
+        }
     }
 }