Feature request: Allow multi select

[TitaniumCoder477]

It would be really handy if the Managed Servers wizard and the Backup Proxies wizard allowed for multi-select so that when I go to add multiple proxies, I can just do it through one invocation of the wizard rather than having to go through the wizard multiple times.

Another cool feature would be to add the capability to target AD groups/objects under Managed Servers and Backup Proxies. For example, creating an AD group called "Proxies" and then opting in/out servers/workstations into that group and never having to touch Veeam since it would be targeting them dynamically.

[Egor Yakovlev]

Valid requests. Noted for internal discussion.
/Thanks!