[Bug 797169] compositor: Remove crossfade property and implement a more extensible interface like in glvideomixer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797169

--- Comment #2 from Thibault Saunier <tsaunier at gnome.org> ---
The goal of that API is to be straight forward to use and just work and my goal
would be to have the same API for other video mixers. The glmixer API is far
from fulfilling that goal to me.

Adding API for different blending modes is orthogonal to that API to me.

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