Smartcontract (#39)

* deleted transfer_output added asset type and transaction result to core

* removed writing 0x00 when buffer length is 0

* Refactored emit into VM package + moved tx to own package.

* implemented transaction along with claimTransaction.

* refactored naming of transaction + added decode address for uint160 types

* removed unnecessary folder and files.

* transaction/smartcontract logic

* bumped version 0.24.0

pkg/core/transaction/input.go

@@ -0,0 +1,36 @@
+package transaction
+
+import (
+	"encoding/binary"
+	"io"
+
+	"github.com/anthdm/neo-go/pkg/util"
+)
+
+// Input represents a Transaction input.
+type Input struct {
+	// The hash of the previous transaction.
+	PrevHash util.Uint256
+
+	// The index of the previous transaction.
+	PrevIndex uint16
+}
+
+// DecodeBinary implements the Payload interface.
+func (in *Input) DecodeBinary(r io.Reader) error {
+	if err := binary.Read(r, binary.LittleEndian, &in.PrevHash); err != nil {
+		return err
+	}
+	return binary.Read(r, binary.LittleEndian, &in.PrevIndex)
+}
+
+// EncodeBinary implements the Payload interface.
+func (in *Input) EncodeBinary(w io.Writer) error {
+	if err := binary.Write(w, binary.LittleEndian, in.PrevHash); err != nil {
+		return err
+	}
+	if err := binary.Write(w, binary.LittleEndian, in.PrevIndex); err != nil {
+		return err
+	}
+	return nil
+}