NLog 4.3.0

KNOWN ISSUE: ${var:myvar} won't work well with the Filetarget in 4.3.0. Will be fixed in 4.3.1. See https://github.com/NLog/NLog/issues/1381 WARNING: if throwExceptions is set to true, it's likely you will see more exceptions then before. Advise: don't set throwExceptions to true in production environments. See also news post. News post: http://nlog-project.org/2016/04/16/nlog-4-3-has-been-released.html # Features - Support Windows Phone 8, Xamarin Android and Xamarin iOS (beta) - Consistent handling of exceptions (BEHAVIOUR CHANGE) - Control of exception throwing for configuration errors - API improvements - Relative paths for fileTarget - InternalLogger: write to System.Diagnostics.Trace - Mail Target: Allow virtual paths for SMTP pickup - EventTarget: option to set the max length of the message and action (discard, split, truncate) - MethodCallTarget: allow optional parameters in called methods. - ConsoleTarget: Regex cache is instead of compiled regex, for better memory usage. This is configurable. - Database target: don't require "ProviderName" attribute when using `<connectionStrings>` - RegistryLayout: Support for layouts, RegistryView (32, 64 bit) and all root key names (HKCU/HKLM etc) - Allow to free CallContext in `MappedDiagnosticsLogicalContext` - LogFactory: Add generic-type versions of `GetLogger()` and `GetCurrentClassLogger()` - Added `Logger.Swallow(Task task)` - Unused targets will be logged to the internal logger - Config classes are now thread-safe. - InternalLogger: improved logging of exceptions (analogous to normal Logger) - More logging to the internal logger (e.g. Async wrapper and buffer wrapper) - Added timestamp options for the internal logger. - Autoload NLog.config in assets folder on Android # Bug fixes Among others: - `${callsite}` works now for async methods! - A **lot of** Filetarget bug fixes regarding with archiving, locking and concurrent writing. Most noticeable: - Use last-write-time for archive file name. This is far more stable. In the past there were some issues with unexpected archive filenames. - Fix: archiving won't work when a there is a date in the filename - Fix: archiving not working properly with AsyncWrapper - Fix: Footer for archiving - Fix: Crashes with relative path without `${basedir}` - Fix: Archive files are never created when there are lot of write in log file - NetworkTarget: fix possible deadlock - Fix autoreload nlog.config with parent configs. - WebServiceTarget: Fix HTTP GET protocol - Bugfix: Internallogger creates folder, even when turned off - Fix possible Nullref in `${variable}` - `${processtime}`: incorrect milliseconds formatting - `${processtime}`: fix incorrect negative time (rounding issue) - FileTarget: Fix writing log files to root dir - Check for TimeToSleepBetweenBatches in AsyncWrapper