It's treated as 5.1 + 2 aux channels. This allows AL_DIRECT_CHANNELS_SOFT to
behave better, not forwarding rear left/right channel inputs to lower front and
upper rear, and allows reporting a more appropriate output mode to the app
instead of 7.1.
To go along with reverse-z on the other axii. This is only for games that have
position/orientation errors causing top-bottom (or left-right) inversion.
This update removes the 16/24-bit sample type enum, now always being 24-bit
(other than a very small size saving, there's no practical benefit to storing
16-bit samples). This also reverses the field storage, so no on-load fixup is
needed, and stores the IR delays with 2 bits of sub-sample precision, allowing
for slightly better timing (after resampling, blending, etc).
AL_LOKI_quadriphonic is left alone since that is what the extension is called
and what code expects. All other instances have been fixed for consistency.
