Refactor signer code into command and package

datastructures/common.go

@@ -2,27 +2,6 @@ package datastructures
 
 import "encoding/binary"
 
-type Action uint8
-
-const (
-	ActionNul = Action(0)
-	ActionSign = Action(1)
-	ActionRevoke = Action(2)
-)
-
-func (a Action) String() string {
-	switch a {
-	case ActionNul:
-		return "NUL"
-    case ActionSign:
-        return "SIGN"
-    case ActionRevoke:
-        return "REVOKE"
-	default:
-		return "unknown"
-	}
-}
-
 func encode24BitLength(data []byte) []byte {
 	lengthBytes := make([]byte, 4)
 	binary.BigEndian.PutUint32(lengthBytes, uint32(len(data)))