EmberAPI\clsAPIHashing

- Marked class as obsolete, as no methods are being used within EMM.
Consider removing this class in a version after v1.4.
EmberAPI\NLog.config

- Corrected XML validation errors on configuration
Error Logging Framework

Updated the error logging framework. This release (v1.4) is using NLog,
however EMM's framework needed some work to enable some very useful
features. Once this commit is merged in, existing calls to
Master.eLog.WriteToErrorLog can be migrated to Master.eLog.<log level>.
This will allow for better logging, and quicker/easier processing of
logs using various log viewer tools.