fix possible parser error in GeometryDataLoadStoreOBJ when input file contains...

fix possible parser error in GeometryDataLoadStoreOBJ when input file contains mixed spaces and tabs

src/ACGL/OpenGL/Data/GeometryDataLoadStoreOBJ.cc

@@ -59,12 +59,10 @@ namespace
     {
         std::vector<IndexTuple> indices;
 
-        std::vector<std::string> vertices = ACGL::Base::StringOperations::split(_string, ' ');
-        for(std::vector<std::string>::const_iterator it1 = vertices.begin();
-            it1 != vertices.end();
-            ++it1)
+        std::stringstream stream(_string);
+        std::string vertexString;
+        while(stream >> vertexString)
         {
-            const std::string& vertexString = *it1;
             std::vector<std::string> componentsString = ACGL::Base::StringOperations::split(vertexString, '/', false);
             IndexTuple indexTuple;