Merge branch 'jk/ansi-color'

The output coloring scheme learned two new attributes, italic and strike, in addition to existing bold, reverse, etc. * jk/ansi-color: color: support strike-through attribute color: support "italic" attribute color: allow "no-" for negating attributes color: refactor parse_attr add skip_prefix_mem helper doc: refactor description of color format color: fix max-size comment