Scramble the destination of the launch controller

Currently, it is possible to fly to other player's space station with a launch controller if a player forgot to remove the destination ID. This scrambles the ID of the launch controller.
It will still be possible to use the launch controller, but you don't know where you are going.

![scrambler](https://cloud.githubusercontent.com/assets/293499/4621517/633fc28a-532c-11e4-8259-5e407075e6f9.png)

Of course, it might be better to add a check to see if the player are in the same space race team. Or add a button which completely locks off players of other space race teams.