OpenMW-CS: Change weather in region.
As apart of the discussion here: https://forum.openmw.org/viewtopic.php?f=20&t=3207&p=36743&sid=21458113ab44290ceaefe3d113271264#p36727
You cannot currently set the weather of a region in OpenMW-CS. This was a problem because OpenMW would crash when there was no weather assigned to a region, this was recently fixed to automatically use a default weather when one isn't found.
(RM-3149 from redmine: created on 2016-01-15 by bret curtis, , closed on 2016-04-08 by Kyle Cooley)