Add hand vectorised avx512 binary operators#961

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XapaJIaMnu wants to merge 4 commits intomasterfrom avx512spec

+821-5

Commits on Jul 25, 2022

On the way to adding avx512 specialisation templates
XapaJIaMnu
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Commits on Jul 26, 2022

First version of avx512intrinsics. Compiles but crashes
XapaJIaMnu
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Commits on Jul 27, 2022

Fixes and optimisations
XapaJIaMnu
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Commits on Jul 28, 2022

Changelog stuff
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