Teledetect, knockout and admin update

Updated the MovementDetection script, it's far simpler now and doesn't
rely on velocity comparison. It's just a simple distance check between
positions recorded each second. Still some bugs to iron out with
dying/spawning.

Made the /goto command developer only, it gets abused way too much.

Improved the KnockOut script, made it mostly standalone now (apart from
the timer, but that's best in the main code really) Custom knockout
durations can now be set and it's not based on health any more.

Tweaked fuel data for two helicopters.

Added knocked-out check for weapon swapping so the knockout animation
can't be exited by changing weapon.