1. Standard library functions snprintf & vsnprintf are available thusly named (without the prepended underscores). Someone may want to check my conditionals against non-MSVC compilers, though.
2. zone/bonuses.cpp throws an internal compiler error with optimize enabled; #pragma disable optimization on VS2015 only on function Mob::NegateSpellBonuses works around it.
This change allows #npcedit
armtexture/bracertexture/handtexture/legtexture/feettexture to work
properly and sets individual armor slot materials for NPCs.
