HelpBuilder.WrapText wraps incorrectly when the text contains VT100 escape sequences

[rvuistin]

It would be nice to support colors in the help engine.

Similar problem as #1973, but this time taking in account that an escape sequence does not use any space in the terminal

[KalleOlaviNiemitalo]

See also #1962 (comment) regarding two-column wrapping with control sequences.

[KalleOlaviNiemitalo]

Would these be tolerable restrictions:

• Only Set Graphics Rendition (SGR) is supported.
• The control sequence must start with ESC [ rather than a single CSI character.
• The line-wrapping logic does not try to understand any parameter values within the SGR control sequence, except it understands that SGR with no parameters resets to default.

So if the text were "a b\x1B[31;42mc d\x1B[37me f\x1B[mg h", and it had to be wrapped at each space character, then the resulting lines would be "a", "b\x1B[31;42mc\x1B[m", "\x1B[31;42md\x1B[37me\x1B[m", "\x1B[31;42m\x1B[37mf\x1B[mg", and "h". Although the parameter 37 fully overrides the preceding 31, the line wrapper would not understand that and it would keep both of them.

By not attempting to understand the parameter values, the line-wrapping logic would be immune to whether subparameters in an ITU T.416 RGB color parameter are delimited with colons or semicolons.