Revert content-length on GZip post

Revert content-length on GZip post

Initial proxy support (custom and default) and HttpClient.CustomReque…

…stModifier

Update AzureConfig and ServerConfigHelper to be in sync with Windows …

…agent on generating hostname

Update AzureConfig and ServerConfigHelper to be in sync with Windows …

…agent on generating hostname

Update NLog.Targets.Stackify dependency for the using 5.x NLog

Add NLog 5.x as depedency to NLog.Targets.Stackify

Make NLog dependency private to allow 4.x and 5.x

Improve InnerException stacktrace placement

Update ErrorItem InnerException position on string generation