NLog: Missing pieces before NLog 5.0 release candidate

Have now made a draft document of the upcoming release:

https://github.com/NLog/NLog.github.io/pull/158

Have the following tasks remaining:

• Extract Msmq-Target into NLog.Msmq-package (and drop NLog.Extended-package)
• Extract Wcf-Target into NLog.Wcf-package
• Extract Mail-Target into NLog.SmtpClient-package
• Extract Database-Target into NLog.Database-package #4351
• Extract Network-Target (Along with NLogViewerTarget + ChainsawTarget) into NLog.NetworkSocket-package
• Extract HostNameLayoutRenderer into NLog.NetworkSocket-package
• Extract LocalIpAddressLayoutRenderer into NLog.NetworkSocket-package
• Extract WebService-Target into NLog.WebRequest-package
• Extract PerformanceCounter-Target into NLog.PerformanceCounter-package
• Extract PerformanceCounterLayoutRenderer into NLog.PerformanceCounter-package
• Extract ImpersonatingTargetWrapper into NLog.WindowsIdentity-package (if possible)
• Extract WindowsIdentityLayoutRenderer into NLog.WindowsIdentity-package
• Extract OutputDebugStringTarget into NLog.OutputDebugStringTarget - Leave behind DebugSystemTarget that can call System.Diagnostics.Debug.WriteLine
• Extract RegistryLayoutRenderer into NLog.WindowsRegistry-package
• Remove QueryPerformanceCounterLayoutRenderer - The layout is called ${qpc} which also doesn’t give much meaning. - Maybe call it NLog.HighPrecisionTiming since nothing to do with Windows PerformanceCounters. - But that name is also misleading since there is no high precision because the layoutrender infers a huge overhead. - Think it should be removed and one should instead use ${scopetiming} or ${processtime}
• Layout<T> should be merged with #3656 #4306
• Add support for better type-name loading to resolve #2944
• Add support for dependency injection of singleton services through LogFactory.Setup().SetupExtensions()
• Add support for fluent setup of NLog-configuration - #4323
• Obsolete NLog.Fluent and introduce optimized LogEventBuilder - #4325
• Remove build and publish of NLog.config-nuget-package
• Major version bump to 5.0-preview1 and publish nuget-package - #4468
• Issues that need attention after releasing NLog 5.0 Preview 1 (needs documentation on wiki)