Support NIF bump map textures in osg
Specifically, components/nifosg/nifloader.cpp can not handle these 4 nif texture properties. From components/nif/property.hpp class NiTexturingProperty GlossTexture, GlowTexture, BumpTexture, and DecalTexture
I know some of my mods are using the bump map texture. I get about 20 warnings for every exterior cell change. Warning: unhandled texture stage 5 in ...
(RM-2801 from redmine: created on 2015-07-27 by Arthur Moore, , closed on 2016-02-24 by scrawl .)