[AudioSystem][IVI]: Implementation of Tizen Audio System/Control API.

This commit implements proposed Tizen System Volume API on xwalk:
  https://wiki.tizen.org/wiki/User:Tanuk/AudioSystemAPI
This commit also includes a demo application that demonstrates the
usage of the api.

This enables to write volume control/settings/mixer type of web applications
using xwalk.

BUG=XWALK-1330
I meant you can try to add `#include <thread>` to see if it can fix the compile error.
And generally if you uses `thread` in class declaration, then better include `<thread>` in header file, otherwise if this header is included elsewhere will get error.