thunderbolt: new panel for device management

Thunderbolt devices need to be approved before they can be used.
This is done via the boltd system daemon and gnome-shell. The new
panel enables the user to manage thunderbolt devices, i.e.:

 - forget devices that have previously been authorized
 - authorize currently unauthorize devices

Additionally authorization of devices an be temporarily disabled
to ensure no evil device will gain access to the computers
resources.

File starting with "bolt-" are copied from bolt's source tree
and currently correspond to the bolt upstream commit with the id
f22b1cd6104bdc2b33a95d9896b50f29a141b8d8
They can be updated from bolt via the update-from-bolt.sh script.

shell/cc-panel-list.c

@@ -276,6 +276,7 @@ static const gchar * const panel_order[] = {
   "wifi",
   "mobile-broadband",
   "bluetooth",
+  "thunderbolt",
   "background",
   "notifications",
   "search",