obj - convert polygons to triangles

[blogdron]

Updated request https://github.com/orangeduck/Corange/pull/40 : Added accounting of texture coordinates for polygonal models

Many 3D editors create polygons instead of triangles by default. And convert each model is inconvenient. And if this is not done, the models are painted without half surfaces. When rendering, only triangles are used, so it seems to me to be good if the polygons are automatically converted into triangles.

• Test models is default blender models (Export without model triangulation)

Polygonaly models before edit obj_load_file()

Polygonaly models after edit obj_load_file()

[blogdron]

f**k i set 2 commits, now close it