Thread safety crash when launching noises from background thread.

[vblanco20-1]

With std::shared ptr option on or off. Doesnt matter. Happens randomly.

Seems to be related to #100 which happens again.

To replicate: Use taskflow or other similar parallel lib to launch multiple generators at once, in my project im launching 4 tasks to do noises at the same time. It seems initialization of simd structures causes a race condition. Currently debugging what is going on here to add more info to this issue.

[Auburn]

I've seen some other instances of this, I think I've got a proper fix for it in the upcoming release. In the mean time try calling GetSIMDLevel() on the main thread before starting your threads, which should stop the threads contesting the initialisation