list: Added focus movement on widget items by mouse in.
list: Added focus movement on widget items by mouse in.

Summary: @feature

Test Plan: elementary_test->List Focus

Reviewers: raster, cedric, woohyun

Reviewed By: raster

CC: seoz

Differential Revision: https://phab.enlightenment.org/D662

rvandegrift/elementary,rvandegrift/elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,tasn/elementary,rvandegrift/elementary,FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary