New meny entry, but no real action for now

Aim: shortcut in order to allow a preselected browser to bypass Tor and
the firewall.
If you click on it, it will punch a hole in iptables, and if possible
launch the browser on some neutral address in order to be caught by the
captive portal.
We will need a way in order to close the hole asap. Maybe once we quit
the browser instance… Or a timer…
new preference fragment, action and stings in order to pre-select apps
removed sqlite support — this will prevent MANY problems
big cleanup in order to remove, for good, sqlite calls. We use now the default preferences backend.
optimize imports
reformated code
lock IPv6
removed useless overrides