Clean up AudioMan

Change various types, fix some bugs, clean up some code warnings, generally match up with SoundContainer
Made SoundContainer a friend of AudioMan and moved some stuff that should always be done through SoundContainer to private (playing soundcontainers and modifying their volume, pitch and position)
Added advanced settings to set random seet and vol0 virtual volume (the latter was recommended by fmod)
Added SetVolume network sound state and data

Author: garethyr