WIP version based on 4a High Level API

WIP version based on 4a High Level API

This is a non-completly working version based on the 4a High Level API.
It displays one slider per audio role, should be able to set volume on
roles, but sliders are not in sync and moving a slider cause a lot of
calls due to bug. Supposed to be fixed soon.

Also, had to hack the autobuild script cause it make cmake to fail.
Obsiously, target 'package' should run 'make widget'...

Change-Id: Ic16ed484e090ebc853e59b836ff1570afdcfce3b
Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>