[det]ansi_sgr(+ClassOrAttributes,
-Sequence:string)false or the class resolves to no attributes.
Unlike ansi_format/4
this does not write to a stream and thus does not require a terminal. It
is used to decorate strings that are handed to code that is not aware of
colors, notably the toplevel prompt (see the Prolog flag toplevel_prompt).
As the caller controls where the sequence ends up, the caller is also
responsible for verifying that the destination is a terminal and for
emitting the reset sequence ‘\e[0m`.