Report logged on user in log file

https://git.scicore.unibas.ch/vamp/auto-tx/blob/master/ATxCommon/SystemChecks.cs#L105

If this turns out to be difficult (or slow) through the ManagmentObject queries we could consider checking for existing explorer.exe processes, e.g. like this:

foreach (System.Management.ManagementObject Process in Processes.Get())
{
    if (Process["ExecutablePath"] != null && 
        System.IO.Path.GetFileName(Process["ExecutablePath"].ToString()).ToLower() == "explorer.exe" )
    {
        string[] OwnerInfo = new string[2];
        Process.InvokeMethod("GetOwner", (object[])OwnerInfo);

        Console.WriteLine(string.Format("Windows Logged-in Interactive UserName={0}", OwnerInfo[0]));

        break;
    }
}