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/Components/Turret.cs

@@ -148,8 +148,10 @@ namespace Barotrauma.Items.Components
         public void ClientRead(ServerNetObject type, NetBuffer msg, float sendingTime)
         {
             UInt16 projectileID = msg.ReadUInt16();
-            Item projectile = Entity.FindEntityByID(projectileID) as Item;
+            //projectile removed, do nothing
+            if (projectileID == 0) return;
 
+            Item projectile = Entity.FindEntityByID(projectileID) as Item;
             if (projectile == null)
             {
                 DebugConsole.ThrowError("Failed to launch a projectile - item with the ID \"" + projectileID + " not found");