## Description of change
In the real `libacio2.dll` implementation,
`ac_io_mdxf_get_control_status_buffer` returns the ring buffer entry at
`(head - index) mod size` but this function was using `(head + index)
mod size` instead. Basically, `index` is supposed to indicate how many
entries back, not forward. This was causing the polling history of each
player to be returned backwards. A few other things were updated to
bring the function's behavior closer to the real implementation:
1. Number of ring buffer entries per player were increased to 16 (this
is the size of them in the real implementation)
2. `ac_io_mdxf_get_control_status_buffer` now returns the current head
of the ring buffer (instead of a success/failure boolean), which is what
`arkmdxp4.dll` expects.
## Testing
I played a few songs to make sure nothing was broken. I also attached a
debugger and verified the ring buffer entries are *actually* now being
returned in reverse chronological order as intended.
cchikeandGitHub
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