Extended rover computer

-Added keep heading mode.
-Added drive to target mode.

After punching in your desired numbers, simply press return to send the
command.
In case of target mode, you can input coordinates by holding <modifier
key> and left clicking where you want the rover to drive to. This works
both in flight and in map view. If you want to immediately send the
drive command, hold <modifier key> and click the right mouse button
where you want to drive.