Efl_Ui: Move elementary and change namespace Ui for ui related models
Select and View is ui characteristic features,
so Efl_Select_Model and Efl_View_Model move to elementary from ecore
seems more natural.
namespace also should changed to Efl.Ui as it's right place.
Test Plan: run the test while building it
Reviewers: cedric, felipealmeida, bu5hm4n, zmike, lauromoura
Reviewed By: zmike
Differential Revision: https://phab.enlightenment.org/D9820