orphaning emerald and retiring emerald-themes

[Nikolay Vladimirov]

Emerald is deprecated and it has next to none upstream support and I
really lost interest in it a while ago.
It has a lot of abrt bugs and it doesn't build against rawhide [1].
If no one objects I'll also retire emerald-themes. There hasn't been
upstream update for emerald-themes in a long time.

[1] http://bugs.opencompositing.org/show_bug.cgi?id=1248

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Best Regards,
Nikolay Vladimirov