Add rendition flags SGRs 2, 8, 9, 53

Adds faint intensity, strikeout, conceal and overline support.

echo -e 'D\e[2mD\e[9mD\e[53mD\e[8mD'

Thanks to Antonio Russo antonio e russo gmail com for patch

REVIEW: 128405
BUG: 362171
(cherry picked from commit 84b43dfb)