Allow ref (&) parameters in contract fns #63

Job	Run time
collect-crates	10s
test-crate (examples/fungible-allowlist)	2m 30s
test-crate (examples/fungible-blocklist)	2m 23s
test-crate (packages/macros)	30s
test-crate (packages/access)	2m 17s
test-crate (examples/fungible-capped)	2m 24s
test-crate (packages/tokens)	2m 32s
test-crate (packages/contract-utils)	2m 16s
test-crate (examples/fungible-pausable)	2m 15s
test-crate (packages/test-utils/event-assertion)	1m 58s
test-crate (examples/fungible-merkle-airdrop)	2m 12s
test-crate (examples/nft-access-control)	2m 20s
test-crate (examples/nft-enumerable)	2m 14s
test-crate (examples/merkle-voting)	2m 17s
test-crate (examples/nft-consecutive)	2m 8s
test-crate (examples/fungible-vault)	2m 14s
test-crate (examples/ownable)	2m 33s
test-crate (examples/sac-admin-wrapper)	2m 13s
test-crate (packages/accounts)	2m 24s
test-crate (examples/pausable)	2m 11s
test-crate (examples/multisig/spending-limit-policy)	2m 20s
test-crate (examples/multisig/account)	2m 4s
test-crate (examples/upgradeable/v2)	2m 57s
test-crate (examples/sac-admin-generic)	2m 16s
test-crate (examples/upgradeable/upgrader)	2m 11s
test-crate (examples/nft-sequential-minting)	2m 32s
test-crate (examples/multisig/ed25519-verifier)	2m 11s
test-crate (examples/upgradeable/v1)	2m 11s
test-crate (examples/multisig/webauthn-verifier)	2m 2s
test-crate (packages/test-utils/default-impl-macro-test)	1m 41s
test-crate (examples/multisig/threshold-policy)	2m 17s
test-crate (examples/nft-royalties)	2m 17s
	1h 9m 0s

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