rpcserver: Add script version to gettxout.

internal/rpcserver/rpcserver.go

@@ -3580,6 +3580,7 @@ func handleGetTxOut(_ context.Context, s *Server, cmd interface{}) (interface{},
 			ReqSigs:   int32(reqSigs),
 			Type:      scriptClass.String(),
 			Addresses: addresses,
+			Version:   scriptVersion,
 		},
 		Coinbase: isCoinbase,
 	}

internal/rpcserver/rpcserverhelp.go

@@ -132,6 +132,7 @@ var helpDescsEnUS = map[string]string{
 	"scriptpubkeyresult-type":      "The type of the script (e.g. 'pubkeyhash')",
 	"scriptpubkeyresult-addresses": "The Decred addresses associated with this script",
 	"scriptpubkeyresult-commitamt": "The ticket commitment value if the script is for a staking commitment",
+	"scriptpubkeyresult-version":   "The script version",
 
 	// Vout help.
 	"vout-value":        "The amount in DCR",

rpc/jsonrpc/types/chainsvrresults.go

@@ -582,6 +582,7 @@ type ScriptPubKeyResult struct {
 	Type      string   `json:"type"`
 	Addresses []string `json:"addresses,omitempty"`
 	CommitAmt *float64 `json:"commitamt,omitempty"`
+	Version   uint16   `json:"version"`
 }
 
 // ScriptSig models a signature script.  It is defined separately since it only