Make Bluetooth adapter choosable for device search

In case there are more Bluetooth adapter, device search
might give different results.

Change-Id: Ideddb39460985c18547baec986b15e43946c85de
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Don't build the qml/quick modules if Qt is built without QtQuick

Change-Id: Ie6a8488a1e2a8ce25ed656a275e86df0006c751b
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>