Release version 1.7.0

Release version 1.7.0

Changes:
 - Add watch-holder skeleton
 - Add ambient-viewer skeleton
 - Fix build error
 - Implement a Launch function
 - Fix file format
 - Implement GetCurrentImage method
 - Adjust modified design
 - Implement resume/pause, bind/unbind
 - Add extension API
 - Implement no_render_push feature
 - Implement NotifyChangedEvent
 - Add WatchMirror class
 - Fix wrong invalid param check
 - Add a new API to get tbm surface
 - Add watch-holder C API
 - Change interfaces

Change-Id: I897b91619f562857d0678daf966c756a5b9deb2b
Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>