misc: make logging closer to C# and write to file

[jsm174]

This will properly support writing a log file to the drive rather than just the calling application.

~/.vpinball/directoutputconfig/GlobalConfig_B2SServer.xml:

<?xml version="1.0" encoding="utf-8"?>
<GlobalConfig xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <DOFPath />
  <CabinetConfigFilePattern>{GlobalConfigDirectory}/CabinetConfig.xml</CabinetConfigFilePattern>
  <LogFilePattern>{GlobalConfigDirectory}/DirectOutput.log</LogFilePattern>
  <EnableLogging>true</EnableLogging>
  <ClearLogOnSessionStart>false</ClearLogOnSessionStart>
</GlobalConfig>

Thanks again to @dekay for letting me know I forgot to port this!