Support for multiple filter images

[Jack29913]

It would be good if algorithm takes a folder of reference images to compare. Another thing -because its small didn't want to create another issue- to have cropped faces in sequence start file name with a number and increment it.

[Tyrannosaurus1234]

I chose to do randomized filenames deliberately, because if you process two videos right after one another into the same output directory, the frames from the second will overwrite the frames from the first because they have the same filename. With 15-character randomized filenames, the chance of that happening is astronomical. I'll look into multiple target images.

[Jack29913]

Not if you save them as "number_random string". Also if you use some hash function you can add prefix so we would know which video it belongs to. Final filename would be: prefix_number_randomstring