SPU2-X: 
The preferred audio output module is PortAudio, so making it the default under Windows now (it is already on Linux).
It will use wasapi mode with the default sound device by default, both are configurable though.
This setup gives us better latency and a higher time stretch polling frequency, resulting in better quality overall.
With this we can also lower the main latency default from 150ms to now 100ms.
There is no error checking for the wasapi mode selection yet, as I don't know how this should be done. 
Help would be appreciated (gigaherz!) :p

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5821 96395faa-99c1-11dd-bbfe-3dabce05a288