Fix MTX broadcaster intermittent bug; pay for bridge transactions #1112
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Closes #1111 . We want people using the safe-control feature to not be obliged to pay for the bridging transaction on the Gnosis Chain side, so have whitelisted the two (currently known / cared about) bridge contracts, and allowed calls to the arbitrary transactions functions on a colony to call exactly
requireToPassMessage
on those contracts and still be eligible for using our metatransaction broadcaster.Also fixes an untracked bug where, if the gas-price oracle used returned certain values, a non-integer would be passed to hexlify which would error. That should now no longer be possible, regardless of what value is returned by the oracle.
Based on #1113 so no merging until that is merged.