NLog logging support for LinqPad

Simple usage method:

1. Add NLog to your LinqPad query
2. Add this package from https://www.nuget.org/packages/zorgoz.Nlog4LinqPad to your query
3. Add use zorgoz.Nlog4LinqPad; to your code (or use LinqPad's tools for this)
4. Add Nlog4LinqPad.LogToHtmlResults(); or Nlog4LinqPad.LogToConsoleResults(); to your code (you could add both, but would make little sense)
5. If needed create a logger instance
6. Start logging
7. Enjoy the results with default settings

The output is highly customisable, but a complete documntation is yet to come...