Restrict AWT permissions

I'm heavily using AWT in the Cities module, so having access to the package would be nice. The problem is that is also contains a few *unsafe* classes.

The good thing is that `AWTPermission` can be used to lock the bad guys out and let the good guys in. Only access to the clipboard (copy & paste to the in-game console) is allowed. Everything else is blocked.

I also added `InvocationTargetException`- very weird things happen if that class cannot be accessed.