Remove qdeclarativebluetoothimageprovider

This class in unfinished and does not work properly plus it introduces a dependency to the svg module.
I also refactored the example where the icon was used.

Change-Id: If3bd5e2eb6b05e090255f1bae0015d69c2a83065
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>