"Font effect" implementation, instead of normal
text, content is converted to "fontwork".

Change-Id: I5d02c7faedb66a4b919e64ae1b830bffb69984c1
Reviewed-on: https://gerrit.libreoffice.org/58358
Tested-by: Jenkins
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>