add SmartInfo

Use smartInfoHub API to display relevant advanced information
during a call.

Change-Id: Ia4e19953e69460ee7e006654cba553bfc2d06581
[stepan.salenikovich@savoirfairelinux.com:  got rid of mem leaks; disconnect
 from signal on destructions; improved menu item; perform start/stop action
 in RingClient so that it can be called from anywhere]
Signed-off-by: Stepan Salenikovich <stepan.salenikovich@savoirfairelinux.com>
Reviewed-by: Stepan Salenikovich <stepan.salenikovich@savoirfairelinux.com>
4 files changed