Introduce safe SIMD API, port some simple vectorized operations to use it #604
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Initial commit of a new API for rten-simd which allows defining vectorized operations without unsafe code.
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This PR is the first step in addressing #549, which will significantly reduce the amount of unsafe code overall in rten.
It introduces a new API for the rten-simd portable SIMD library, which allows defining SIMD operations using safe code, and ports some of the simpler vectorized operations in rten-vecmath (Sum, SumSquare, SumSquareSub, MinMax) to use it.
TODO: