ServerEntityEventManager doesn't process received events until the character inputs of the client for the corresponding frame have been processed (fixes character movement lagging behind EntityEvents at the servers side)

+ split character networking logic into a separate file, characters drop items at the position of their collider instead of hands

Subsurface/Source/Networking/NetEntityEvent/NetEntityEvent.cs

@@ -83,6 +83,8 @@ namespace Barotrauma.Networking
     {
         private IClientSerializable serializable;
 
+        public UInt16 CharacterStateID;
+
         public ClientEntityEvent(IClientSerializable entity, UInt32 id)
             : base(entity, id)
         { 
@@ -91,6 +93,7 @@ namespace Barotrauma.Networking
 
         public void Write(NetBuffer msg)
         {
+            msg.Write(CharacterStateID);
             serializable.ClientWrite(msg, Data);
         } 
     }