Consider support not widely supported styles as `faint`

[medikoo]

All styles are listed here: https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters

I think we miss:

• faint
• rapidBlink

Still it needs to be discussed, whether support should be implemented when they may not have effect in some envs

In case of faint and rapidBlink it could be ok, as not having them doesn't affect readability of output.