refactoring

[alexlib]

Hi @yosefm,

I'd gratefully appreciate if we could continue this effort.

if you could please help me to make https://github.com/alexlib/openptv/blob/refactor_fb/liboptv/src/main.c working - this would be great to show the 1Vision how to work with 4 frames.
your virtual_functions branch of course if we'll make it working with more than 4 frames, i.e. continously, with buffer read from RAM (e.g. as we discussed - reading 10 frames before that, fill in a large buffer and then track through it)
We'll then try to combine the BlobReader.py that reads blob.dat files into that buffer.

Thanks
Alex