[neo-project/neo] Unique type of transactions (#339)

In NEO 2.x, we have many different types of transactions:

— MinerTransaction
— IssueTransaction
— ClaimTransaction
— EnrollmentTransaction
— RegisterTransaction
— ContractTransaction
— StateTransaction
— PublishTransaction
— InvocationTransaction

Most of them are obsolete, and the remaining types of transactions can be easily implemented in smart contracts. The only thing we need to keep is `InvocationTransaction`.

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