[Neo Core Style] update smartcontract struct and name · neo-project/neo@4ca1f9c

Cannot convert null literal to non-nullable reference type.

'Conflicts' is obsolete: 'Use ConflictsAttribute instead'

'OracleResponse' is obsolete: 'Use OracleResponseAttribute instead'

'Conflicts' is obsolete: 'Use ConflictsAttribute instead'

'OracleResponse' is obsolete: 'Use OracleResponseAttribute instead'

'NotValidBefore' is obsolete: 'Use NotValidBeforeAttribute instead'

'NotValidBefore' is obsolete: 'Use NotValidBeforeAttribute instead'

'Conflicts' is obsolete: 'Use ConflictsAttribute instead'

'OracleResponse' is obsolete: 'Use OracleResponseAttribute instead'

'Conflicts' is obsolete: 'Use ConflictsAttribute instead'

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