jseFunctions file has been removed and functions has been refactored:
 - jseRequest -> Engine.ajaxRequest
 - jseCreateClass -> newObject (declared before engine in Engine.js)
 - jseInherit -> Moved inside newObject
 - jsonEncode -> Removed (too specialized for Cliff City Defence - JSON.stringify can be used instead)
 - jseSyncLoad -> Engine.loadFiles
 - jsePurge -> Engine.purge