Fix the region setup bug.

Previously, the set() method would overwrite coordinates completely
without min/max'ing the values to preserve the invariant that p1 is
the lowest point and p2 the highest.
Version 0.95.2

Hotfixing region issues.
Update plugin.yml towards next release.
Change the way region setting works.

The region now contains two location references per region point for
the bounding boxes where p1, p2, l1 and l2 remain the same (min/max),
but also additional locations for the player's actual location, such
that e.g. moving back and re-setting a point has the more intuitive
behavior of expanding regardless of the optimized points.

This also (hopefully) finally fixes the previous issues with the setup
process *knock on wood*.
Version 0.95.3

- Make the region setup more intuitive
- Fix the lobby region issue
- (Hopfully) fix the setup process
Update plugin.yml towards next release.