Update NetworkSetup preflet and Interfaces add-on.

Many updates including:
* Add translation strings
* MAC address in Interface Settings Window
* Lots of layout kit improvements, works font sizes 8pt to 18pt.
* Add right-click context menu to interfaces list view.
* Make the Interfaces list view size a bit bigger.
* Wired/Wireless settings use BStringViews instead of BTextViews
  since they aren't editable.
* First interface is selected by default
Ignore calls whose purpose is to calculate the GOT address.

- Fixes several false positives where we'd show a return value for the
  current function.