Implement credit deal auto-repayment feature

[abitmore]

PR for #2595.

Changes:

• Add enum class credit_deal_auto_repayment_type

   /// Defines automatic repayment types
   enum class credit_deal_auto_repayment_type
   {  
      /// Do not repay automatically
      no_auto_repayment = 0,
      /// Automatically repay fully when and only when the account balance is sufficient
      only_full_repayment = 1,
      /// Automatically repay as much as possible using available account balance
      allow_partial_repayment = 2,
      /// Total number of available automatic repayment types
      CDAR_TYPE_COUNT = 3
   };
  

• Update type of extensions field of credit_offer_accept_operation struct, add an auto_repay field inside, so that accounts can decide whether and how to automatically repay when accepting a credit offer

   struct credit_offer_accept_operation : public base_operation
   {  
      struct ext
      {  
         /// After the core-2595 hard fork, the account can specify whether and how to automatically repay
         fc::optional<uint8_t> auto_repay;
      };
      asset                    fee;                ///< Operation fee
      account_id_type          borrower;           ///< The account who accepts the offer
      credit_offer_id_type     offer_id;           ///< ID of the credit offer
      asset                    borrow_amount;      ///< The amount to borrow
      asset                    collateral;         ///< The collateral
      uint32_t                 max_fee_rate = 0;   ///< The maximum acceptable fee rate
      uint32_t                 min_duration_seconds = 0; ///< The minimum acceptable duration
      extension<ext> extensions; ///< Extensions
   };
  

• New operation: credit_deal_update_operation, so that credit deal owners can change whether or how to automatically repay

  • operation_type = 76
  • default fee 1 BTS

   struct credit_deal_update_operation : public base_operation
   {
      struct fee_params_t { uint64_t fee = 1 * GRAPHENE_BLOCKCHAIN_PRECISION; };
  
      asset                    fee;                ///< Operation fee
      account_id_type          account;            ///< The account who owns the credit deal
      credit_deal_id_type      deal_id;            ///< ID of the credit deal
      uint8_t                  auto_repay;         ///< The specified automatic repayment type
      extensions_type extensions;  ///< Unused. Reserved for future use.
   };
  

• Rename all fee_parameters_type in the codebase to fee_params_t to get around the "string table overflow" issue in MinGW build

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