edje_cc: Add copy item for proxy part

edje_cc: Add copy item for proxy part

Refs: master, <origin/HEAD>, <origin/master>, v1.20.0-beta2-43-g4211822
Author:     jiin.moon <jiin.moon@samsung.com>
AuthorDate: Fri Jul 14 11:29:50 2017 +0900
Commit:     Jean-Philippe Andre <jp.andre@samsung.com>
CommitDate: Fri Jul 14 11:39:44 2017 +0900

    edje_cc: Add copy item for proxy part

    Summary:
    Although user use "inherit" in a state of proxy part,
    the inherit function does not copy the source_visible and
    the source_clip value of parent to the state.

    Test Plan: {F1751132}sample

    Reviewers: jpeg, cedric

    Differential Revision: https://phab.enlightenment.org/D5017

    @fix

Change-Id: I35e7eafd558d1e41b6d49e70ab0ebf8f63e93ae5