* Network now monitors all network, and network settings changes, and
will notify all add-ons about those changes.
* Removed the global apply button. Instead, the static IP configuration
now got that button. All other changes will be instant.
* Added (still incomplete) helper classes for the settings messages.
* The net_server now uses these classes for its interfaces, and services.
* Renamed service_address to service_connection, as that better matches
what it is used for.
* As experimental API class BNetworkSettings.
* Added add/remove methods for interfaces, and services, too.
* Moved the conversion of the wireless networks into the settings class,
too, so that it only gives out converted ones (but accepts both
variants).
* 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.
