Upcoming versions of the Windows Console will be able to differentiate
a color set by the Win32 API from a color set by VT. This code
transforms a Win32 color into a VT color, and then uses that VT color
during rendering. When an enlightened console host receives this VT, it
may handle it differently (translate it differently, reverse it
differently, store it differently). Use `39;49` for the default foreground/background.
We'll also teach the various console implementations how to
handle it.
Dustin L. Howett
90422ac2ad