iang/arctic: Library and benchmark program for Arctic and Shine @ 781bb6e9f467144517c24c7031077e6372ec587e

Ian Goldberg 781bb6e9f4 combinecomm_noverify becomes agg to match the paper		vor 11 Monaten
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bin	4a5cb38b30 gen now returns (Scalar, RistrettoPoint) to match the paper	vor 10 Monaten
arctic.rs	781bb6e9f4 combinecomm_noverify becomes agg to match the paper	vor 10 Monaten
lagrange.rs	752e61a8c3 We never use the Lagrange interpolate function, but we keep it for completeness	vor 10 Monaten
lib.rs	cfaab14f83 cargo fmt	vor 10 Monaten
shine.rs	781bb6e9f4 combinecomm_noverify becomes agg to match the paper	vor 10 Monaten