Follow clang-tidy and clazy suggestions

variables non-POD should not be 'static' outside a class. Always use and init variables. Delete useless classes.

Mesh.cpp

@@ -263,7 +263,6 @@ bool parsePLY(string ascii,
                         break;
                     default:
                         // ignore normals or other types
-                        value = parseValue<float>(stringstream);
                         break;
                     }
                 }