Summary:
Since Stack_Manager displays fade in/out transition effects, the class
name is renamed from Stack_Manager to Fade_Manager.
Depends on D11142
Reviewers: segfaultxavi, bu5hm4n, zmike
Reviewed By: segfaultxavi
Subscribers: cedric, #reviewers, #committers
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D11143
