[Bug 763182] Add roll property to GstTextBaseOverlay

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from César Fabián Orccón Chipana <cfoch.fabian at gmail.com> ---
This property is useful to create title credits like the ones that appears at
the end of movies, for example.

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