Support pitch in non-complex sounds.
Support missing wavebanks like XNA does.
Added weighted randomization support.
Added volume variation support.
Added pitch variation support.
We now read the priority level.
Did a little formatting cleanup.
We now can read panning randomization info.
Fixed event info for simple play events.
Added support for single track and multi-track play events with volume/pitch/filter variation.
Merge pull request #2942 from SickheadGames/xact1

More XAct Improvements