Fix window startup crash

src/render/vbo.cpp

@@ -163,18 +163,19 @@ void Vbo::config(int glsl){
     int colors_size  = _colors.size() * sizeof(Element_col);
     int texture_size = _texture_coord.size() * sizeof(Element_pos);
     int shaded_size;
-    Element_pos * vertex = &_vertex[0];
-    Element_col * colors = &_colors[0];
-    Element_pos * texture = &_texture_coord[0];
+    Element_pos* vertex = _vertex.data();
+    Element_col* colors = _colors.data();
+    Element_pos* texture = _texture_coord.data();
+
     char * shaded;
     float* shaded2;
     if(glsl<330){ //use float for color gradient
         shaded_size = _shaded2.size() * sizeof(float);
-        shaded2 = &_shaded2[0];
+        shaded2 = _shaded2.data();
     }
     else{ //use char for color gradient
         shaded_size = _shaded.size() * sizeof(char);
-        shaded = &_shaded[0];
+        shaded = _shaded.data();
     }
     //Delete old vbo if necessary
     if(glIsBuffer(_vboID) == GL_TRUE)