Similar to the font-features-settings in CSS, this is a low-level
API that allows you to pass the information to the shaper in order
to enable or disable specific font features by name.
[ChangeLog][QtGui][Text] Added an API to QFont which makes it
possible to enable and disable specific typographic features
in OpenType fonts.
Change-Id: Ib48c678f3b97a5a562b08ae34dc895800c8885c0
Reviewed-by: Lars Knoll <lars@knoll.priv.no>
