Release Notes - 3.4.8

Additions

• Added WTSApi32 missing constants and correlated types
• Added Computer.Sessions property and supporting classes to discover active sessions.
• Added missing enums to Dhcp project
• Added new Vanara.Net assembly with support for DNS services and DHCP clients.

Fixes

• Fixed BackgroundCopyJob.CustomHeaders (#310)
• Fixed BackgroundCopyManager.Version code based on suggestion from @OwnageIsMagic (#311)
• Fixed #312 by implementing BackgroundCopyFileCollection.CopyTo and Contains
• Added helper properties and fixed parameters in DnsApi