DSound has since been deprecated and xaudio2 would require us to write our own 3d spatialization and mixer
Load devices the same way we load in the gfx end
setup sfx provider
run sfx devices on startup
various fixes around sfx null device
added the bitrate and samplerate globals
added the hrtf global code is in to use this but not setup yet
Adds speed of sound to the sound system
SFXAmbience now has a property for speed of sound for different mediums, can also be set directly
Many instances where we would create a object via a new call, and then check that it was non-null.
This is redundant, as if we ever were in a situation where new failed, we'd be crashing left and right already, so the additional check is wasted processing.
