Radius based regeneration commands

[StargateMC]

In v4.0 of Regenerator having radius support for the regen and map commands would be a worthwhile endeavour.

What the radius support would do is kick off a fake "parse" that only includes the effected chunks, which would allow for it to only regenerate chunks specified by the player.

I'll also allow the CONSOLE to support coordinates as well, or world spawn, for those who want to schedule their own events to occur.

Docco will come with the rewrite for v4 - there won't be any resets to config required though... So admins don't need to worry.