Managed Mode .NET: use of SSE4/AVX intrinsics (ssmd)

[nijnstein]

Use System.Numerics.Intrinsics when compiling outside unity for .net. While a burst/il2cpp toolchain is used to compile blast in unity with use of intrinsics for .net we need to do this manually for large sections of the code illegable for such optimizations.

• Add SSE4 & AVX2 Support to all array operations

Dueue to the nature of this optimization for windows mainly the ssmd interpretors will benifit as they work on large arrays of data.

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