Replace proof of fairness with a PDL with Slack proof from GG18/20 #26
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This utilizes the PDL With Slack ZK proof from GG18/20 (https://github.com/ZenGo-X/multi-party-ecdsa/tree/master/src/utilities/zk_pdl_with_slack) and uses range-proofs from ZenGo-X/multi-party-ecdsa#145 to validate it.
Also added a check for the moduli size to make sure it's ~2048 bits.
I still need to update the Readme to remove any mention of the fairness proof