UPD Script n1

Rewritten completely (plus the change of library) Features: * Brake upgrade; * Speed upgrade; * Track magnets; * Get checkpoints; * Get cart ( if the map has a free cart ); * Delete junks; * Delete enemies. Removed: * Redeem codes; * Visible rails. I intend to add when I update: * Bring back redeem codes; * Rewrite 'destroy enemies'.