Dump format on error.
Removed PlatformSetMasterVolume().
XAudio no longer uses MasterVoice.SetVolume.
Added SoundEffectInstance._isXAct.
SoundEffectInstancePool now supports XAct sound instances.
We no longer apply SoundEffect.MasterVolume on XAct sound instances.
Removed volume clamps in XActSound.
XActSound now applies the category volumes.
AudioCategory volume now scales the track volumes.
Merge pull request #2890 from SickheadGames/sfxvol

XAct Volume Improvements