Add example opengl-3dmodels, uses .obj in opengl

-Add new example: Show diffence in performance drawing methods and how
to load a .obj with normals(works without too)
-Press H to show hidden cube
-Press W to chance drawing method

Signed-off-by: Gustavo Jaruga <darksshades@gmail.com>
Add ASD to change drawing primitive, F to hide fps

-Add A and D to change drawing primitive
-Add S to return back to GL_TRIANGLES
-Add F to hide/show FPS and triangles in console
-Change objects to blue

Signed-off-by: Gustavo Jaruga <darksshades@gmail.com>