NLog 4.5 RC7

• #2612 add final param to AddRule Methods (#2612) (@893949088)
• #2590 WebServiceTarget - JsonPost with support for single nameless parameter (@snakefoot)
• #2604 FileTarget - Failing to CreateArchiveMutex should not stop logging (#2604) (@snakefoot)
• #2592 Make Set methods of MDC and MDLC return IDisposable (#2592) (@MikeFH)
• #2591 callsite-filename renderer (#2591) (@brunotag)
• #2597 Replace WINDOWS_UWP with NETSTANDARD1_3 to support UWP10 shared libraries (@snakefoot)
• #2599 TryImplicitConversion should only check object types (@snakefoot)
• #2595 IsSafeToDeferFormatting - Convert.GetTypeCode is faster and better (@snakefoot)
• #2609 NLog - Fix Callsite when wrapping ILogger in Microsoft Extension Logging (@snakefoot)
• #2613 Attempt to make some unit-tests more stable (@snakefoot)
• #2603 MultiFileWatcher - Improve error handling if FileSystemWatcher fails (@snakefoot)