Implement regions for assignment to the overland.

[Arthmoor]

The overland could use some kind of new region system, similar to how Oblivion and Skyrim handle it. For AFKMud's purposes, the following is probably adequate:

• Weather type assignments (after the new code is in)
• Regional bounties for criminal activity.
• Large scale regions for the continent tags we're using now.
• Tie in to the mob generation system so that mobs can be set to spawn in certain region types.