hmi-controller is a reference how to use libweston-layout.so
The UI consists of Top bar and background. Top bar has
 several switch to change layouts; tiling, side by side, full screen, and
 random. Switch events are notified to hmi-controller which changes layout
 surfaces by using common layout library; libweston-layout.so.
Add image files for hmi-controller
Modify ivi-shell/Makefile to build references; hmi-controller and hmi-client
Modify example clients to support ivi-application.xml