ObjFileLoader for Python 3

Hi!

Here is OBJFIleLoader that supports Python 3 and relative path to textures: https://github.com/yarolig/OBJFileLoader

I going to copy it to wiki soon (https://www.pygame.org/wiki/OBJFileLoader). Need to check it in different environments.

I will try to support OpenGL 3 and ModernGL (in github, not in wiki). I am aware of some interesting discussions about this library here https://pyweek.org/d/3066/ (Warming up: motion demo) and here https://groups.google.com/forum/#!topic/pygame-mirror-on-google-groups/eFY_nm_D0pM ([pygame] Faster OBJ loader)

I know have about a week to do it.

And just the last moment I found https://pyweek.org/d/3623/ (Faster OBJ loader). Going to use it too.