Merge pull request NLog#1504 from NLog/fix-movenext-for-asyncmethods-…

…with-return-value

Fix ${callsite} with async method with return value

Merge pull request NLog#1456 from bhaeussermann/branch0

FileTarget: Fix premature termination of appender-invalidator-thread.

Merge pull request NLog#1411 from NLog/improve-mail-from-property

MailTarget: fix "From" errors (bug introduced in NLog 4.3.2)

Merge pull request NLog#1404 from NLog/filetarget-thread-background

FileTarget cleanup: move to background thread.

Merge pull request NLog#1386 from NLog/fix-InitializeTarget-exception

Fix "allLayouts is null" exception

Merge pull request NLog#1211 from NLog/nlogconfig-4.3

Update nlog.config for 4.3

Merge pull request NLog#1348 from NLog/fix-nullref-with-default-targe…

…t-parameters

Fix nullref + fix relative path for file archive

Merge pull request NLog#1335 from NLog/fix-build-warnings

Fix all build warnings

Merge pull request NLog#1323 from NLog/fix-includeTimestamp-xml-option

Add TimeStamp options to XML, Appsetting and environment var

Merge pull request NLog#1220 from bhaeussermann/branch0

FileTarget: Add internal logging for archive date.