Add REGEN to the Regen Marketplace currency AllowList

This proposal, if passed, will add REGEN to the Regen Ecocredit Marketplace allow list, adding it as one of the many currency options in which buyers and sellers may transact./nA YES result on proposal will add REGEN to the allow list, represented by the denom:/nbank_denom: uregen/ndisplay_denom: regen/nexponent: 6/nA NO result would not add REGEN to the allow list.