Allow ref (&) parameters in contract fns #52

Job	Run time
collect-crates	10s
test-crate (packages/test-utils/event-assertion)	52s
test-crate (packages/tokens)	1m 54s
test-crate (packages/contract-utils)	1m 17s
test-crate (examples/fungible-allowlist)	1m 14s
test-crate (examples/merkle-voting)	1m 0s
test-crate (packages/access)	1m 15s
test-crate (examples/fungible-pausable)	1m 32s
test-crate (packages/macros)	24s
test-crate (examples/nft-royalties)	1m 26s
test-crate (examples/fungible-capped)	1m 15s
test-crate (examples/nft-consecutive)	1m 22s
test-crate (examples/fungible-blocklist)	1m 39s
test-crate (examples/fungible-merkle-airdrop)	1m 23s
test-crate (examples/fungible-vault)	1m 59s
test-crate (examples/ownable)	1m 40s
test-crate (examples/nft-enumerable)	1m 10s
test-crate (examples/sac-admin-wrapper)	1m 20s
test-crate (examples/nft-sequential-minting)	58s
test-crate (examples/pausable)	1m 21s
test-crate (examples/multisig/account)	1m 59s
test-crate (examples/nft-access-control)	2m 0s
test-crate (packages/test-utils/default-impl-macro-test)	58s
test-crate (examples/upgradeable/v2)	1m 2s
test-crate (examples/sac-admin-generic)	1m 24s
test-crate (examples/upgradeable/upgrader)	1m 2s
test-crate (examples/multisig/ed25519-verifier)	1m 7s
test-crate (examples/multisig/threshold-policy)	52s
test-crate (examples/multisig/spending-limit-policy)	1m 20s
test-crate (packages/accounts)	1m 12s
test-crate (examples/multisig/webauthn-verifier)	1m 34s
test-crate (examples/upgradeable/v1)	1m 11s
	40m 52s

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