More sanity checks to make sure clients aren't doing something they're not allowed to:

- AICharacter, hull, structure and submarine updates from clients are ignored
- character updates from anyone else than the client controlling the character are ignored
- players can't pick/drop items from anyone else's inventory (unless the target is unconscious/stunned/cuffed)
- server has authority over reactor temperature

Subsurface/Source/Map/Entity.cs

@@ -93,13 +93,28 @@ namespace Barotrauma
             dictionary.Add(id, this);
         }
 
+        /// <summary>
+        /// Writes the state of the entity into the message
+        /// </summary>
+        /// <param name="data">some data that was saved when the networkevent was created</param>
+        /// <returns>false if something went wrong when filling the message, true if the msg is ready to be sent</returns>
         public virtual bool FillNetworkData(NetworkEventType type, NetBuffer message, object data) 
         {
             return false;
         }
-        public virtual void ReadNetworkData(NetworkEventType type, NetIncomingMessage message, float sendingTime, out object data) 
+
+        /// <summary>
+        /// Updates the state of the entity based on the data in the message
+        /// </summary>
+
+        /// <param name="sendingTime"></param>
+        /// <param name="data"></param>
+        /// <returns>false if the message is not valid (client trying to change something they're not authorized to, corrupt data, etc) and should be ignored</returns>
+        public virtual bool ReadNetworkData(NetworkEventType type, NetIncomingMessage message, float sendingTime, out object data)
         {
             data = null;
+
+            return false;
         }
 
         /// <summary>