feat: chafa sixel

merge: development

readme: add notice

fix: #717

fix: #714

fix: kitty thumbnails overflow

fix: shortcuts

feat: preview_window_width

feat: selection_meta_key, action_meta_key for easier keybind changing

fix: #712

fix: --preview-side could be something ytfzf couldnt handle

fix: the default on_no_thumbnail no longer dies so that on_no_thumbnail_<ext> can be called

fix: trim_blank trims too many blanks

feat: add -csi as an alias for -cSI and -cs as an alias for -cS

style: run ytfzf through shfmt