chore: remove use of default for points and scalars #142
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The use of the
Default
implementation for Ristretto point and scalar types is somewhat non-idiomatic, since it isn't immediately clear what a "default" point or scalar must be. In practice, these are the identity group element and zero scalar, respectively.This PR removes ambiguity and makes the library more future proof by removing all such uses. Instead, it uses the
Identity
implementation for point types and theZERO
constant for scalars.Closes #141.