[PD] ASIO support

[Johannes Taelman]

Nice!
After tweaking the DefaultInputDevice and DefaultOutputDevice I get stable
operation on MAudio Audiophile2496, Terratec EWS88D and the EchoAudio
Layla24. All tested with a latency of 256 samples @ 44.1kHz under Win2k
(in Standard PC mode, not ACPI).

Tonight I'll look at enabling multi-channel operation and try my RME
Hammerfall DSP again.

thanks a lot!

Johannes