Implement most of missing functionality for fixed point #48
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This makes it so simd_horizontal_sum and simd_horizontal_product can be implemented for fixed point numbers.
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This PR implements missing functionality for fixed point numbers that is needed for parry to use fixed point numbers as reals instead of f32 or f64.
Some of the functionality is generalized and some of it is implemented only for FixedI32F32 fixed point number, as that is what I used to test this with parry.
I would like to get this completed for all fixed point numbers, so parry or other crates can use arbitrary fixed point numbers, but I am not sure how to continue (there is some
Fromconversions in fixed_point.rs that I know how to generalize, but I am not sure how toimpl_float_simd!for all fixed point numbers).Could anyone point me in correct direction in order for me to complete this?