* add nsfw image censoring
activatable via config, uses CompVis/stable-diffusion-safety-checker
* fix progressbar call for nsfw output
* use config to set cache dir for safety checker
* add checkbox black_out_nsfw
makes both enabling via config and checkbox possible, where config overrides the checkbox value
* fix: add missing diffusers package
* feat: extract safety checker, remove dependency to diffusers
* feat: make code compatible again after merge with main
* feat: move censor to extras, optimize safety checker file handling
* refactor: rename folder safety_checker_models to safety_checker