Character: Fixed some car-related bugs

- a bug in car collision would make one of the cars freeze forever (inAutoRoute
  was not properly reset)

- when a car is on a pedwalk, and hero approaches, hell breaks loose. Works a
  bit better now, but still there are accidental kills. Also car is now not
  frozen after these emergency moves.

- made hero slightly slower and cars a bit faster... cheating for now.