[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 #4 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
The problem with having such a specific property is that it makes extending
difficult later. How should the crossfade-ratio property behave in combination
with having set a specific blending mode?

Also having to keep the crossfade-ratio property would mean that all this
special-casing in compositor has to stay, while with a generic blending
configuration system there is not even the need for special-casing. You simply
blend the different inputs on top of each other with the correct blending
operations.

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