hash2curve: configurable mapping function
#1433
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This PR adds the ability for the
hash2curvestandalone functions to take a configurable mapping function.To that effect the following changes were made:
MapToCurvetrait is now only used for mapping functions.HashToCurvetrait is introduced holding the curve parameters that were previously onMapToCurve.MapToCurveimplementation:ShallueVanDeWoestijne,Elligator2,Decaf448Map.ShallueVanDeWoestijne.AffineOsswuMapworkaround, which isn't needed anymore.Resolves #1422.