[Bug 763182] textoverlay: add "roll" property

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763182

--- Comment #2 from César Fabián Orccón Chipana <cfoch.fabian at gmail.com> ---
I found out there this is not seekable. I will fix that if it is worth to merge
the feature upstream.

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