Remove ff::PrimeFieldRepr#223

Merged

str4d merged 10 commits into

zcash:masterfrom

str4d:remove-primefieldrepr

Apr 30, 2020

Commits on Mar 26, 2020

group: Take scalar by reference in CurveProjective::recommended_wnaf_for_scalar
str4d
committed
group: Rewrite wNAF to remove dependency on ff::PrimeFieldRepr
str4d
committed

Commits on Mar 27, 2020

ff: Move pow_vartime into a trait that is generic over the limb size
str4d
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