Removed logger.dll and all references

Removed due to it generating the below error when used over prolonged
periods pending  further investigation or ideally abstraction to allow
the implementing application to decide how to log.

System.IndexOutOfRangeException: Index was outside the bounds of the
array.
at System.Collections.Generic.List`1.Add(T item)
at logger.logger.log(Byte loglevel, String logMessage)
at CasparCGNETConnector.CasparCGConnection.sendCommand(String cmd)