horizon: post audit solidity changes#1121

juanmardefago wants to merge 4 commits intographprotocol:horizongraphprotocol/contracts:horizonfrom

juanmardefago:juanmardefago/add-extra-params-query-fees-collectedjuanmardefago/contracts:juanmardefago/add-extra-params-query-fees-collectedCopy head branch name to clipboard