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adds support for VT100 256 colors, and 24 bit RGB
The only terminal color feature that I am aware of that we still don't support is the ANSI bright / non-bright distinction.
It should also improve the handling of unrecognized color escapes (stripping, rather than leaving untouched).
Definitely needs testing, as the 256-color support is a bit complicated (ping @ivanov).
There is one related benefit that I was able to get this into a single replace call with regular expressions,
rather than a sequence of replacements, so it might be faster than before.
closes #3617