feat: Allow users to render usage, help, and errors with ANSI #4248
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This ensures usage, help, and error can render to a
StyledStr
and we expose astyled.ansi()
method for displaying ANSI escape codes.This gives users enough control that they can render to a different stream, even a pager if they want, while still getting color, see #1788 .
This supersedes #3874
Fixes #3873