Implement DelegateGroup minting policy and metadata validator#13

errfrom wants to merge 3 commits intodshuiski/delegate-infomlabs-haskell/hydra-auction-onchain:dshuiski/delegate-infofrom

dshuiski/delegate-groupsmlabs-haskell/hydra-auction-onchain:dshuiski/delegate-groupsCopy head branch name to clipboard