Speeds up walking from 7 delay to 4. Removes the hardcoded walk/running delays, and uses the config options instead.
Changed legcuffs to use slowdown instead of forcing the user to walk.
Adjusts movement_delay() for aliens, to use inheritance!
Speeds up drones, they are now the same speed as sentinels.
Merge pull request #2446 from Petethegoat/walkspeed

Speeds up walking from 7 delay to 4.