Network: integrated former hardware view from add-on.

* The interfaces logic is within the main application, so is the
  new interface view.
* Disabling/renegotiating does not work yet.
* Reveals a bug in some interface code; when you click on an ethernet
  device first, there is no place for the wireless menu. When you then
  press on a wireless device, it crashes in BMenuField code.
  In the other direction, there is then an empty space.
* Fixed list item width reporting.

headers/os/add-ons/network_settings/NetworkSettingsAddOn.h

@@ -41,8 +41,9 @@ public:
 			const BNetworkProfile*
 								Profile() const;
 
-	virtual	status_t			Save() = 0;
+	virtual	status_t			Apply() = 0;
 	virtual	status_t			Revert() = 0;
+	virtual bool				IsRevertable() = 0;
 
 private:
 			const BNetworkProfile*