moved border checking routine out into a timed task, for even lower server impact
added new configurable "delay" value, for the number of ticks it will wait between border checks, the default is 4 (~200ms); each server tick is ~50ms or so
added new configurable "knockback" value, for how far back inside the border to move a stray player, the default is 3.0
changed world-name encoding method for worlds with dots in the name to use an uncommon high-range ASCII character ("¨"), since forward-slash ("/") can occur in world names; don't worry, old configurations which have the "."->"/" encoding will be automatically and safely converted
split command listing to 2 pages for players, since there are too many commands to fit on the screen now
