refactor tile serialize

include/td/protocol/command/Commands.h

@@ -13,6 +13,7 @@
 #include <td/Types.h>
 #include <td/common/NonCopyable.h>
 #include <td/protocol/command/CommandData.h>
+#include <sp/io/SerializableMessage.h>
 
 namespace td {
 namespace protocol {
@@ -32,8 +33,6 @@ class CommandHandler;
 
 using CommandBase = sp::MessageBase<CommandID, CommandHandler>;
 
-using CommandPtr = std::unique_ptr<CommandBase>;
-
 template <typename TData, CommandID ID>
 using CommandMessage = sp::ConcreteMessage<TData, CommandBase, ID>;
 
@@ -61,5 +60,7 @@ using CommandFactory = sp::MessageFactory<CommandBase, AllCommands>;
 
 using LockStep = std::vector<std::shared_ptr<CommandBase>>;
 
+using CommandPtr = std::unique_ptr<sp::SerializableMessage<CommandFactory>>;
+
 }  // namespace protocol
 }  // namespace td