Mod/Mesh: suppress bunch of warnings on C++11 usage

Warnings was like:
src/Mod/Mesh/App/WildMagic4/Wm4Vector4.cpp|21 col 49| warning: first declaration of static data member specialization of 'ZERO' outside namespace 'Wm4' is a C++11 extension [-Wc++11-extensions]

src/Mod/Mesh/App/WildMagic4/Wm4Matrix3.cpp

@@ -16,7 +16,8 @@
 
 #include "Wm4FoundationPCH.h"
 #include "Wm4Matrix3.h"
-using namespace Wm4;
+
+namespace Wm4 {
 
 template<> const Matrix3<float> Matrix3<float>::ZERO(
     0.0f,0.0f,0.0f,
@@ -35,3 +36,5 @@ template<> const Matrix3<double> Matrix3<double>::IDENTITY(
     1.0,0.0,0.0,
     0.0,1.0,0.0,
     0.0,0.0,1.0);
+
+}