enables edge rendering using Freestyle, save edges with bop writer

[maivnov]

Proposal to extend the pipeline with Freestyle edge rendering of target objects in the scene and save the edge renders using the writer_bop. An example using the T-LESS dataset is provided in main_tless_random

All files were auto formatted using the black extension.

[cornerfarmer]

Thanks @maivnov, is there an easy way to undo the formatting? This makes the review a lot harder and I would rather stay with our current coding style.

[maivnov]

I changed my formatting to your style and also added some fixes for Windows paths, since some parts of the code are hardcoded for Linux. I also updated the main_tless_random example and it runs fine on my machine