Starting with the generate_bboxes postprocessing

Bunch of scripts for some simple post-processing of GTAVisionExport repo.

It is another kind of post-processing than is mentioned in their paper. For their original post-processing, see this repo.

You need to connect to database where managed plugin stores data. Copy file gta-postprocessing.ini.example to gta-postprocessing.ini and there fill the database credentials.