[Bug 797112] basetextoverlay: Add text background color option

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797112

--- Comment #1 from Vivia Nikolaidou <vivia at ahiru.eu> ---
Created attachment 373591
  --> https://bugzilla.gnome.org/attachment.cgi?id=373591&action=edit
basetextoverlay: Add text background color option

Default to 0 (transparent black), to maintain previous behaviour.

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