Cadence 1.0 refactor

[sisyphusSmiling]

Closes: #18

All contracts passed local migration

[
    {
        "kind": "contract-update-success",
        "account_address": "0xf8d6e0586b0a20c7",
        "contract_name": "CoinToss"
    },
    {
        "kind": "contract-update-success",
        "account_address": "0xf8d6e0586b0a20c7",
        "contract_name": "Xorshift128plus"
    }
]

And staged on Testnet and Mainnet in transactions:

• Testnet
  • Xorshift128plus - 6a5e9273a64b774021d3f45d5ddee0297889e365c61d912b22c65fd466c56389
  • CoinToss - c61c036cdadc361eef74e3954a7d8dd310f247808e27b97df55e88ce254f9289
• Mainnet
  • Xorshift128plus - bd3b33da216b2bd4e2c3e2cde45a585bb92348bb44c4030fb1e4328fafce16b4

[sisyphusSmiling]

good call, updated in ee993aa