Support for specifying bridged interface name by guid, not only name

[M@…]

Some network interface drivers on Windows has ability to display interface options and description in various languages based on current user set locales. This could lead to situations where VM template created for such shared system could not be started when target user uses different locale ("Network interface named XXX could not be found") as the interface description, used by VirtualBox for bridged network, is different - altough the real interface stays the same. As the interface guid (using eg. vboxmanage list bridgedifs) stays the same, it would be benefitial to use this instead of interface description in VM configuration.

[Socratis]

Related discussion in the forums: ​https://forums.virtualbox.org/viewtopic.php?f=6&t=88354