OpenMW-CS: rename "model" column to make its purpose clear
The TES-CS calls it "Animation", too. This is the case at least for NPCs. "Model" sounds like "the engine needs this data to display somehting so I need to put something here". "Animation" rater sounds like it is something optional.
(RM-2694 from redmine: created on 2015-06-17 by Who Knows, , closed on 2018-05-05 by Alexei Dobrohotov)