efl_ui_spotlight: Introduce animation manager
the manager is basically not new, its just the moved fade manager, with
a little bit more utilization. The manager now can be equipt with 3
animaton objects that are played when the correct reason happens.
For now the fade manager is the only thing that uses that.
Reviewed-by: Jaehyun Cho <firstname.lastname@example.org>
Differential Revision: https://phab.enlightenment.org/D11358