Now we have 3 different API compatible MPMC queues that we can swap with
swapping the header.
mt_mpmc.h, a blocking queue that uses a mutex/critical section.
lf_mpmc.h, a lock free queue that uses atomics.
sm_mpmc.h, a hybrid queue that uses atomics and a semaphore to block
when the queue is empty.
In this program, for max performance it is recommanded to use sm_mpmc.h
or mt_mpmc.h, they are designed to avoid busy waiting which frees more
CPU time to do useful work.
The windows implementation is disabled, currently registering files in
IO Ring when there is inflight IO operations causes corruptions.
Implementing a config file.
Some code cleanup
The IO Ring now supports bashing multiple submissions and can handle
multiple files at the same time.
Hashing small files using XXH3_128bits() instead of the streaming
pipeline(XXH3_128bits_reset(), XXH3_128bits_update(),
XXH3_128bits_digest()), this reduses the overhead of creating a state
and digest, coupled with the IO Ring it improves the hashing of small
files whose size is inferior to the size of IO Ring buffers
