WIP: Add random scene generation through python script

[jeromepl]

Not to be merged quite yet:

TODO list:

• Generate random object rotations, translations and scales similarly to what was done for the Pix2Surfels paper
• Verify with someone that it is normal that only the first light's position is generated and that only the first 3 components of its position vector are generated
• Render some of the scenes and compare that the results are similar (This is to check that the new OpenGL renderer is working as expected)