db_spawn_vehicles.pl update and added update_bans.pl

The current implementation of db_spawn_vehicles.pl did not allow one to spawn vehicles and do cleanup in a single pass. If any of the cleanup options were picked then vehicle spawning was skipped. I patched it to allow spawning or cleaning or both as desired.

update_bans.pl is a script I've been using for a while to merge various ban lists with my own private bans. If you think it is useful you can add it in.