Images sequence with img2img

[piallai]

A proposition to generate images sequences using img2img, without reloading the model for each frame: https://github.com/piallai/stable-diffusion.cpp
Provided --init-img and --output are the same file, images sequence generation is automatic.
The number of frames can be defined. For stabilization, image cropping at each frame is also possible.

Related to: #367 (comment)