efl_model : rename all efl_model based classes.

efl_model : rename all efl_model based classes.

Summary:
As the result of discussion in T7458,
we need to rename all efl_model based classes with efl_XXX_Model sequence.
I've run few vote for this, see V42, V43
few classes are totally renamed as our consideration of misnaming.

| Efl.Model_Loop | Efl.Loop_Model |
| Efl.Model_Item | Efl.Generic_Model |
| Efl.Model_Container | Efl.Container_Model |
| Efl.Model_Container_Item | Efl.Container_Model_Item |
| Efl.Model_Composite | Efl.Composite_Model |
| Efl.Model_Composite_Boolean | Efl.Boolean_Model |
| Efl.Model_Composite_Boolean_Chlidren | Efl.Boolean_Model_Item |
| Efl.Model_Composite_Selection | Efl.Select_Model |
| Efl.Model_Composite_Selection_Chlidren | Efl.Select_Model_Item |
| Efl.Model_View | Efl.View_Model |
| Eio.Model | Efl.Io.Model |
| Efl.Ui.Model_State | Efl.Ui.State_Model |
| Efl.Ui.Model_Size | Efl.Ui.Size_Model |
| Efl.Ui.Model_Exact | Efl.Ui.Exact_Model |
| Efl.Ui.Model_Average | Efl.Ui.Average_Model |
| Efl.Ui.Model_Homogeneous | Efl.Ui.Homogeneous_Model |

I worried about Efl.Io.Model changes, cause it is widely used,
but as I tested, there is no issue found yet.

Eldbus.Model also may can changed Efl.Dbus.Model,
but I cannot found any class who using Efl.Dbus namespace,
so I left it future work.

Test Plan:
Run the Make Test,
it works well except Efl test about selection.
there are class inheritance problem exist in select_model,
I reported it and will fix it in another patch.

Reviewers: cedric, felipealmeida, woohyun, Hermet

Reviewed By: cedric

Subscribers: lauromoura

Tags: #efl, #do_not_merge

Differential Revision: https://phab.enlightenment.org/D7533