Misc Av changes in Apps

1) Do not reset mBrowserDevice when sending browsing response.
2) Abs vol corrections.
3) Redundant declarations.
4) Logging corrections.
5) tracknum uid fix.
6) second media player info added.
7) Send error to GetTotalItems req if MediaController invalid.

Change-Id: Id64cda7911db3f6f2c43c0ea44b1bd854a5787e4