fix bug with player not getting updated on disconnect (related to issue #24)

jint version downgraded for better stability (also locked the engine instance as it's not thread safe)
updated readme
remove vpn detection from application configuration as it's now in a seperate plugin
defaulted webfront bind URl to all interfaces
readd the custom say name
added visibility percentage to AC

SharedLibraryCore/Interfaces/IEventHandler.cs

@@ -13,6 +13,6 @@ namespace SharedLibraryCore.Interfaces
         /// Add a game event event to the queue to be processed
         /// </summary>
         /// <param name="gameEvent">Game event</param>
-        bool AddEvent(GameEvent gameEvent);
+        void AddEvent(GameEvent gameEvent);
     }
 }